While not nearly as compact as a Rolly, there's something to be said about a 2.4" tall dancing robot that straps any music player to its back and dances a jig... Oh, and it will chase you around the house, too. Anyone have the COPS theme? It's the Hasbro Ampbot, coming this summer for $500. I wonder how you program it?

There's a writeup about it on Engadget, too...