Here's my slide deck from the CLR v4 talk at the 2009 Belgium and Finland Tech Days. It's been updated slightly to reflect changes in the security model that I didn't have time to cover in my talk. Also, keep in mind that there are a few 3.5 SP1 features discussed in this deck--startup performance, client profile and full GC notifications.

If you have any questions about new functionality in CLR v4 please feel free to send me a mail or post a question on the CLR team blog at http://blogs.msdn.com/clrteam.