Service Pack 1 for .NET 3.5 and Service Pack 1 for Visual Studio 2008 have been released.

Some downloads for .NET Framework:

online installer
full package - 237MB includes several versions of the framework for several operatin systems and architectures

Some downloads for Visual Studio 2008:

online installer
iso image - 851MB contains SP1 for all versions of VS

   The Express Editions are not patched but installed over the old versions. Online and offline installers can be found here.

   These releses add MANY features. Most of them are listed here. Enjoy!