ASP.NET Dynamic Data Preview
Oh man! This bit of news Rocks!
Scott Guthrie just announced today that the ASP.NET team has released an updated ASP.NET Dynamic Data Preview.
http://weblogs.asp.net/scottgu/archive/2008/04/10/asp-net-dynamic-data-preview-available.aspx
Read about the changes, and download the releases:
http://code.msdn.microsoft.com/dynamicdata
My favorite improvements are for LINQ and the awesome ListView component.
Something that will probably excite a lot of developers is the Dynamic Data Website Wizard.
Notice in the bottom section of Scott's article he has posted links to Screen Casts and other helpful resources.
A good place to get help all day long is the ASP.NET Dynamic Data Forum:
http://forums.asp.net/1145.aspx
There are Dynamic Data samples on MSDN:
http://code.msdn.microsoft.com/dynamicdata/Wiki/View.aspx?title=Samples%20Page&referringTitle=Home
Silverlight Screen Cast of the Dynamic Data Wizard:
http://silverlight.services.live.com/invoke/63271/DynamicDataWebsiteWizardScreencast/iframe.html
These are exciting times. 
Salute,
Mark Wisecarver
Microsoft Technical Evangelist for http://DiscountASP.NET