Sony is supposedly working on a universal game controller, similar to a universal remote for TV's, that will control your PS3, XBOX, and even the Nintendo Wii.
"it would be useful to have a universal controller that would be able to work with a variety of game consoles"
The device would include an integrated speaker, vibration feedback, on-board storage, various game pad-like buttons, an option to ape an alphanumeric keypad, and another to emulate older game consoles.