VS 2008 and .NET 3.5 include a ton of new features for ASP.NET development.  We are planning to deliver even more ASP.NET functionality next year with a "ASP.NET 3.5 Extensions" release.  The first public preview of this will be available for download next week on the web.

Next week's ASP.NET 3.5 Extensions preview release will include:

ASP.NET MVC

This model view controller (MVC) framework for ASP.NET provides a structured model that enables a clear separation of concerns within web applications, and makes it easier to unit test your code and support a TDD workflow.  It also helps provide more control over the URLs you publish in your applications, and more control over the HTML that is emitted from them.  You can learn more about it from Part 1 of my ASP.NET MVC Tutorial series.  I'm hoping to find time this weekend to write and post Part 2 of the series.

ASP.NET AJAX Improvements

New ASP.NET AJAX features in the ASP.NET 3.5 Extensions release will include better browser history support (back/forward button integration, and server-side history management support via a new <asp:history> server control), improved AJAX content linking support with permalinks, and additional JavaScript library improvements.

ASP.NET Dynamic Data Support

The ASP.NET 3.5 Extensions release will deliver new features that enable faster creation of data driven web sites.  It provides a rich scaffolding framework, and enables rapid data driven site development using both ASP.NET WebForms and ASP.NET MVC.

ASP.NET Silverlight Support

With the ASP.NET 3.5 Extensions release we'll deliver support for easily integrating Silverlight within your ASP.NET applications.  Included will be new controls that make it easy to integrate Silverlight video/media and interactive content within your sites.

ADO.NET Data Services

In parallel with the ASP.NET Extensions release we will also be releasing the ADO.NET Entity Framework.  This provides a new modeling framework that enables developers to define a conceptual model of a database schema that closely aligns to a real world view of the information.  We will also be shipping a new set of data services (codename "Astoria") that make it easy to expose REST based API endpoints from within your ASP.NET applications.