I think Visual Stuido 2008 SP1 and .NET Framework 3.5 Service Pack 1 (not beta) is released today. You can go and download it from this link.
- Visual Studio 2008 SP1
- .NET Framework 3.5 SP1
- Visual Studio 2008 Express Editions with SP1
- Visual Studio Team System 2008 Team Foundation Server SP1
Silverlight Tools Beta 2 has been updated to support Visual Studio 2008 and Visual Studio 2008 SP1. Here is the link where you can download the latest version of silverlight_chainer.exe.