I just watched appfuse screencast which I downloaded from their homepage. All I can say is, it really rocks! It's cooler than netbeans' CRUD feature and the code it generate seems much cleaner. The security features are a blast as well! I really like it and I'm looking forward to using it in my future personal/professional projects.
Since I'm currently learning a lot of things on my own, I figured out my brain couldn't take it much longer(i.e. information overload) so I let two of my teammates take a look at it and I hope they would get impressed and use it(i.e. experiment).
If you're into Java and looking for a cool technology to play with, try appfuse. You can read on the seven simple reasons on why to use it.