Travis explains a cool extension to the "Clone" capability in the browser:

There's also a new special form of Clone that shows up in the class menu only when you have a class and its superclass selected. It's called Blend. What it will do is create a clone of the two classes, collapsed into a single class. I spent some time playing with this at OOPSLA, and came to the conclusion (with agreement for the Master Refactorers, Don Roberts and John Brant), that you can't do this as a strict in place refactoring. So it's done as a clone.

See Travis' post for an explanation - it's a nifty way to clean up deep hierarchies that you no longer need.

Now Listening to: Born In The U.S.A. by Bruce Springsteen from: Live 1975-85 [Disc 2]