True compile-time AOP (Aspect Oriented Programming) for .NET

PostSharp is a open source project that enables us to have TRUE build-time AOP whcih is VERY cool....

I ran across this very cool open source project the other day and thought it might be useful for alot of people.  It is VERY cool and the first one I've seen that actually delivers true compile-time aspect oriented programming:

http://www.postsharp.org/aop.net/