For those of you that like to stay on top of the latest technologies, Microsoft just released the ASP.NET 3.5 Extensions Preview today which provides the following new functionality (quoted from the http://www.asp.net Website):

ASP.NET MVC

ASP.NET MVC provides model-view-controller (MVC) support to the existing ASP.NET 3.5 runtime, which enables developers to more easily take advantage of this design pattern. Benefits include the ability to achieve and maintain a clear separation of concerns, as well as facilitate test driven development (TDD).

The ASP.NET MVC Toolkit provides HTML rendering helpers and dynamic data support for MVC.

ASP.NET Dynamic Data

ASP.NET Dynamic Data helps developers build a fully customizable, data-driven app quickly. It provides a rich scaffolding framework that allows rapid data driven development without writing code, yet it is easily extendible using the traditional ASP.NET programming model.

ASP.NET AJAX

New additions to ASP.NET AJAX include support for managing browser history (Back button support).

ADO.NET Entity Framework

ADO.NET Entity Framework is 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. Benefits include easier to understand and easier to maintain application code that is shielded from underlying database schema changes.

ADO.NET Data Services

ADO.NET Data Services provide new services that find, manipulate and deliver data over the web using simple URIs. Benefits include an easy and flexible way to access data over the web, while enabling the separation of presentation and data access code.

Silverlight Controls for ASP.NET

You can integrate the rich behavior of Microsoft Silverlight into your Web application by using two new ASP.NET server controls: a MediaPlayer server control that enables easy integration of media sources such as audio (WMA) and video (WMV) into your Web application, and a Silverlight server control that allows an ASP.NET page to reference both XAML objects and their event handlers.

If you're still trying to get your head around new features released in Visual Studio 2008 and .NET 3.5 (and who isn't since they just came out) then this new preview release may really make your head swim.  We're all in that boat though. :-)  There's a lot of new things to look into and get to know that can significantly enhance developer productivity which is the ultimate goal.