Even though it's been a while since it was announced, most people I talk to are still confused about what the .NET Framework 3.0 really is. There are a bunch of blog posts out there describing what it is (I linked to a few in June) but Jason Zander from the .NET Framework team did a Channel 9 interview that consolidates all the information in one place.
Check it out:
http://channel9.msdn.com/ShowPost.aspx?PostID=217428