This is in .Net framework 2.0 SDK beta1 documentation. But oddly enough,
this is not in MSDN for Visual Studio 2005 beta1. And this is not in
MSDN web site. Anyway, I copied the list from 2.0 SDK beta1
documentation below:

[Omitted changes in ADO.Net, ASP.Net, WinForm, System.Xml, since they
are too long, and desire separate articles]

64-Bit Platform Support

The new generation of 64-bit computers
enables the creation of applications that can run faster and take
advantage of more memory than is available to 32-bit applications. New
support for 64-bit applications enables users to build managed code
libraries or easily use unmanaged code libraries on 64-bit
computers.

Access Control List Support

An access control list (ACL) is used to grant
or revoke permission to access a resource on a computer. New classes
have been added to the .NET Framework that allow managed code to create
and modify an ACL, and new members that utilize an ACL have been added
to the I/O, registry, and threading classes.

Authenticated Streams

Applications can use the new NegotiateStream
and SslStream classes for authentication and to help secure information
transmitted between a client and a server. These authenticated stream
classes support mutual authentication, data encryption, and data
signing. The NegotiateStream class uses the Negotiate security
protocol for authentication. The SslStream class uses the Secure
Socket Layer (SSL) security protocol for authentication.

COM Interop Services Enhancements

Four major enhancements have been made to the
classes and tools that support interoperability with COM:

·                        
The operating system
maintains a limited number of handles, which are used to reference
critical operating system resources. The new SafeHandle and
CriticalHandle classes, and their specialized derived classes, provide
safe and reliable means of manipulating operating system handles.

·                        
Marshaling improvements
make interoperating with native code easier. Two enhancements to the
interop marshaler satisfy the two most common user requests: the ability
to wrap native function pointers into delegates, and the ability to
marshal fixed-size arrays of structures inside structures.

·                        
The performance of calls
between applications in different application domains has been made much
faster for common call types.

·                        
New switches on the Type
Library Importer (Tlbimp.exe) and Type Library Exporter (Tlbexp.exe)
tools eliminate dependency on the registry to resolve type library
references. This enhancement is important for creating robust build
environments.

Console Class Additions

New members of the Console class enable
applications to manipulate the dimensions of the console window and
screen buffer; to move a rectangular area of the screen buffer, which is
useful for performing smooth, simple animation; and to wait while
reading console input until a key is pressed. Other new class members
control the foreground and background colors of text, the visibility and
size of the cursor, and the frequency and duration of the console
beep.

Data Protection API

The new Data Protection API (DPAPI) includes
four methods that allow applications to encrypt passwords, keys,
connections strings, and so on, without calling platform invoke. You can
also encrypt blocks of memory on computers running Windows Server 2003
or later operating systems.

Debugger Display Attributes

Developers can now control how Visual Studio
displays a class or member when an application is being debugged. The
debugger’s Display Attributes feature enables a developer to identify
the most useful information to display in the debugger.

Debugger Edit and Continue Support

The .NET Framework 2.0 Beta reintroduces the
Edit and Continue feature that enables a user who is debugging an
application in Visual Studio to make changes to source code while
executing in Break mode. After source code edits are applied, the user
can resume code execution and observe the effect. Furthermore, the Edit
and Continue feature is available in any programming language supported
by Visual Studio.

Detecting Changes in Network Connectivity

The NetworkChange class allows applications
to receive notification when the Internet Protocol (IP) address of a
network interface, also known as a network card or adapter, changes. An
interface address can change for a variety of reasons, such as a
disconnected network cable, moving out of range of a wireless local area
network, or hardware failure. The NetworkChange class provides
address change notification by raising events when a change is
detected.

Disjunctive Demands

In prior versions of the .NET Framework, you
could not allow multiple code identities access to a class or method.
For example, only one strong name could be demanded at a time, creating
a problem in situations such as testing multiple strong-named assemblies
from different sources. What was needed was a way to combine identity
elements using a bitwise OR operation. In response to this need, new
disjunctive security actions have been created that allow multiple
identity permissions to be simultaneously demanded,
inheritance-demanded, or link-demanded. In the case of strong-named
assemblies, a developer using the DemandChoice security action can now
demand several strong name identities, any of which will allow the stack
walk to succeed. The three new security actions that allow disjunctive
demands are DemandChoice, InheritanceDemandChoice, and
LinkDemandChoice.

Distributed Computing

In the System.Net namespace, support has been
added for FTP client requests, caching of HTTP resources, automatic
proxy discovery, and obtaining network traffic and statistical
information. The namespace now includes a Web server class
(HttpWebListener Class) that you can use to create a simple Web server
for responding to HTTP requests. Classes that generate network traffic
have been instrumented to output trace information for application
debugging and diagnostics. Security and performance enhancements have
been added to the System.Net.Sockets.Socket and System.Uri
classes.

In the System.Web.Services namespaces,
support for SOAP 1.2 and nullable elements has been added.

In the System.Runtime.Remoting.Channels
namespaces, channel security features have been added. The TCP channel
now supports authentication and encryption, as well as several new
features to better support load balancing.

EventLog Enhancements

Developers can now use custom DLLs for
EventLog messages, parameters and categories.

Expanded Certificate Management

The .NET Framework now supports X.509
certificate stores, chains, and extensions. In addition, you can sign
and verify XML using X.509 certificates without using platform invoke.
There is also support for PKCS7 signature and encryption, and CMS (a
superset of the PCKS7 standard available on Microsoft Windows 2000 and
later operating systems). PKCS7 is the underlying format used in
Secure/Multipurpose Internet Mail Extensions (S/MIME) for signing and
encrypting data. For more information, see
System.Security.Cryptography.X509Certificates.X509CertificateEx.

FTP Support

Applications can now access File Transfer
Protocol (FTP) resources using the WebRequest, WebResponse, and
WebClient classes.

Generics and Generic Collections

The .NET Framework 2.0 Beta introduces
generics to allow users to create flexible, reusable code. Language
features collectively known as “generics” act as templates that allow
classes, structures, interfaces, methods, and delegates to be declared
and defined with unspecified, or generic type parameters instead of
specific types. Actual types are specified later when the generic is
used. Several namespaces, such as System Namespace and
System.Collections.Generic, provide generic classes and methods. The new
System.Collections.Generic namespace provides support for strongly
typed collections. System.Nullable<T> is a standard
representation of optional values. Generics are supported in three
languages: Visual Basic, C#, and C++.

Reflection has been extended to allow runtime
examination and manipulation of generic types and methods. New members
have been added to System.Type and System.Reflection.MethodInfo,
including HasGenericParameters to detect identify generic types (for
example, class Gen<T,U> {...}),
GetGenericParameters to obtain type parameter lists, and
BindGenericParameters to create specific types, for example,
new Gen<int, long>().

Globalization

Five new globalization features provide
greater support for developing applications intended for different
languages and cultures.

Support for custom cultures enables
developers to define and deploy culture-related information as needed.
This feature is useful for creating minor customizations of existing
culture definitions, and creating culture definitions that do not yet
exist in the .NET Framework. For more information, see the
T.System.Globalization.CultureAndRegionInfoBuilder class.

Encoding and decoding operations map a
Unicode character to or from a stream of bytes that can be transferred
to a physical medium, such as a disk or a communication line. If a
mapping operation cannot be completed, developers can compensate by
using the new encoding and decoding fallback feature supported by
several classes in the System.Text namespace.

Users who require greater performance from
the UTF8Encoding class, which implements UTF-8, the most common encoding
used to transform Unicode characters into bytes on computers, will be
pleased to know that members in this class are now several times faster
than in previous releases.

The .NET Framework now supports the latest
normalization standard defined by the Unicode Consortium. The
normalization process converts character representations of text to a
standard form so the representations can be compared for equivalence.

The GetCultureInfo method overload provides a
cached version of a read-only CultureInfo object. Use the cached version
when creating a new CultureInfo object, to improve system
performance and reduce memory usage.

I/O Enhancements

Improvements have been made to the usability
and functionality of various I/O classes. It is now easier for users to
read and write text files and obtain information about a drive.

Developers can now use the classes in the
System.IO.Compression namespace to read and write data with the GZIP
compression and decompression standard, described in the IETF RFC 1951
and RFC 1952 specifications, available at http://www.ietf.org.

.NET Framework Remoting

.NET Framework remoting now supports IPv6
addresses and the exchange of generic types. The classes in the
System.Runtime.Remoting.Channels.Tcp namespace support authentication
and encryption using the Security Support Provider Interface (SSPI).
Classes in the new System.Runtime.Remoting.Channels.Ipc namespace allow
applications on the same computer to communicate quickly without using
the network. Finally, you can now configure the connection cache
time-out and the number of method retries, which can improve the
performance of network load-balanced remote clusters.

Obtaining Information about Local Computer Network Configuration and Usage

Using classes in the
System.Net.NetworkInformation namespace, applications can access IP,
IPv4, IPv6, TCP, and UDP network traffic statistics. Applications can
also view address and configuration information for the local computer’s
network adapters. This information is similar to the information
returned by the Ipconfig.exe command-line tool.

Ping

The Ping class allows an application to
determine whether a remote computer is accessible over the network. This
class provides functionality similar to the Ping.exe command-line tool,
and supports synchronous and asynchronous calls.

Processing HTTP Requests from within Applications

You can use the HttpListener class, you can
create a simple Web server that responds to HTTP requests. The Web
server is active for the lifetime of the HttpListener object and
runs within your application with your application’s permissions. This
class is available only on computers running the Windows XP Service Pack
2 or Windows Server 2003 operating systems.

Programmatic Control of Caching

Using the classes in the System.Net.Cache
namespace, applications can control the caching of resources obtained
using the WebRequest, WebResponse, and WebClient classes.
You can use the predefined cache policies provided by the .NET Framework
or specify a custom cache policy. You can specify a cache policy for
each request, and define a default cache policy for requests that do not
specify a cache policy.

Security Exceptions

The System.Security.SecurityException class
has been expanded to provide additional data that facilitates
investigation into the cause of security exceptions. New properties
provide information that includes the method in which the exception
occurred, the first permission that failed, the zone or URL of the
assembly, the security action that failed, and the security action on
the call stack, such as Deny or PermitOnly, that caused the
exception.

Serial I/O Device Support

The new SerialPort class provides
applications with the ability to access the serial ports on a computer,
and to communicate with serial I/O devices.

Serialization

The BinaryFormatter class now supports
version-tolerant serialization, which allows a type to be deserialized
from the serialization of a different version.

XML serialization now supports the use of
properties instead of fields to represent schema elements, the
serialization of generic types, and the use of the Nullable!1 structure
to represent nullable elements. The IXmlSerializable interface supports
custom schema generation.

The new XML Serializer Generator (Sgen.exe)
allows you to precompile the code used by Web services clients to
serialize transmitted information, greatly improving the client startup
time.

SMTP Support

Using the classes in the System.Net.Mail and
System.Net.Mime namespaces, applications can send e-mail to one or more
recipients. Mail can be sent with alternate views and can include
attachments. Sending carbon copies and blind carbon copies is also
supported.

Strongly-Typed Resource Support

The Resource File Generator (Resgen.exe) tool
creates resource files that are embedded in executable files and
satellite assemblies. The Resgen tool produces a wrapper class for each
resource file, which gives the developer easy access to resources and
prevents spelling mistakes in resource names.

Threading Improvements

Developers can now name cross-process
communication events that are created purely in managed code. Also, the
Semaphore class supports specialized resource counting.

Trace Data Filtering

The .NET Framework 2.0 Beta provides classes
that trace and log system events related to I/O, application startup and
shutdown, and so on. However, the enormous volume and diverse types of
trace information make it difficult for users to analyze this data. New
support for trace data filtering enables the user to specify the type of
information to be logged.

Transactions

The new System.Transactions namespace
contains classes that allow your applications to participate in
transactions managed by the Microsoft Distributed Transaction
Coordinator (DTC) or other transaction managers. You can use the
TransactionScope class to create simple, transactional code blocks, or
the ITransaction and IEnlistmentNotification interfaces to maintain
participation through each phase of a multiple-phase distributed
transaction. This transaction infrastructure can easily interoperate
with the existing System.EnterpriseServices (COM+) transaction
infrastructure. A new LightweightTransactionManager class provides a
faster alternative to the DTC for simple transactions.

Web Services

Web services support SOAP 1.2 and the WS-I
Basic Profile 1.0, which is documented at
http://www.ws-i.org/Profiles/Basic/2003-08/BasicProfile-1.0a.html.

When consuming two or more Web services that
define a shared type, the client proxies generated for those Web
services share the corresponding type on the client. This allows clients
to easily pass instances of shared types among Web services.

You can now invoke Web methods asynchronously
using an event-based programming pattern.

本来这个相应在转贴区,不过,我期望再一次多少人能看出。
初稿地址:http://blogs.msdn.com/junfeng/archive/2004/08/01/203813.aspx

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