It wasnt too long ago that I was talking about .Net 3.0 being a new offering from Microsoft's technology stack. Guess what? Now Microsoft is ready with .Net 3.5 that is going to be released with Visual Studio Orcas later this year. I would not go in the details instead will let you download the CTP bits from MSDN.
If you are wondering whats included in technology stack with .Net 3.5. Then i will suggest you to read this blog post by Thom Robbins.
Amazing stuff! Lets get started!