The other main change that Sony has implemented is replacing the traditional L2, and R2 buttons with analog triggers, similar to the Xbox and Gamecube controllers. Sony has also introduced a "home" button in the middle of the controller to access the PS3's XMB interface.
All of these features have come at a cost though. Sony's SIXAXIS does not have rumble support at all. No rumble in the SIXAXIS has been a controversial point, and Sony claims they removed rumbe functionality for economic reasons.