Hi,
Microsoft has released sp1 for dot net framework 3.5 and visual studio 2008 The SP1 has following feature update for
Dot Net framework
Asp.Net Dynamic data
Asp.net Ajax Browser history
Asp.net Ajax Script combining
Ado.Net data services
Ado.net entity framework
The SP1 for visual studio 2008 also has many notable bug fixes. You can find a list of the fixes here.
You can download the SP1 for dot net