All this talk of COD4 on playstation 3 makes it sound brilliant and i've been watching the clips on you tube. However, i've always found aiming difficult with those controller things and prefer first person shoot em ups on pc cos you can use the mouse and keyboard etc.

Am i right in thinking you can use a standard usb mouse on ps3?

and if so what's the Playstation 3 XFPS Rate Up Keyboard/Mouse Adapter type thing for?