What is the six axis motion sensing system?
“The PS3 SIXAXIS is a controller that is nearly identical to that of the predecessor’s DualShock. The SIXAXIS features finer analogue sensitivity, more trigger-like R2 and L2 buttons, a PS button, and a USB mini-B port for charging the internal battery and use for wired play. The PlayStation 3 supports up to 7 simultaneous controllers over Bluetooth. The SIXAXIS is named for its ability to detect motion in the full six degrees. Similar to a light version of the Nintendo Wiis motion sensing Wiimote. However unlike the previous DualShock, this new controller has no vibration feature.” – http://en.wikipedia.