New Framework Design Guidelines were published. See them here http://www.amazon.com/Framework-Design-Guidelines-Conventions-Development/dp/0321545613?ie=UTF8&qid=1224001412&sr=11-1

What's New in the 2nd edition?
Updated with new features from .NET Framework 3.0 and 3.5
Tons of new annotations from industry experts
Extension methods
Linq, Linq, Linq!!
New Async Pattern
Serialization guidelines
Dependency Properties guidelines
Significant updates to the Exceptions section
Small things such as operator parameters, DateTimeOffset, Nullable
Nearly every page has some sort of update from small grammar fixes to wording clarifications