Today the Visual Studio 2008 and .NET Framework 3.5 have been released.
Both will be officially launched in February 2008, but are already available to developers as of today.
MSDN subscribers can get their version from the MSDN Subscribers page. Trail versions are available for download also via the Visual Studio 2008 Trail Downloads page.
For more information visit the blog posts by Scott Guthrie, Somasegar and The Moth.
Be sure to check out the Top 10 things to know about Visual Studio 2008 and .NET Framework 3.5.