This is a question we get quite frequently and so we thought we'd share a couple of blog posts by Microsoft Evangelist Daniel Moth.

In the following post, Daniel hghlights what is new to .NET 3.5 (with links to further information about several new or updated assemblies) as well as the concept of red-bits vs. green bits.

http://www.danielmoth.com/Blog/2007/06/net-framework-35.html

Another key related bit of information has to do with versioning as many times folks are confused as to the Minor, Build and Revision parts of the .NET Framework versions. Daniel clears a bit of that up with the following post:

http://www.danielmoth.com/Blog/2007/05/clr-v20-remains-at-same-version.html