ASP.NET in the .NET Framework 3.5 Service Pack 1 release includes numerous bug fixes. In addition, it includes features for the following:
Enabling high-productivity data scenarios by using ASP.NET Dynamic Data.
Supporting the browser navigation in ASP.NET AJAX applications by using ASP.NET AJAX browser history.
Increasing the download speed for ASP.NET applications by using ASP.NET AJAX script combining.
http://www.asp.net/downloads/35-sp1[
^]