My trackpad/computer sometimes just freezes out of the blue.. I move my cursor around click.. and sometimes just freezes and i either have to put it to sleep by putting down the lid.. and reopen it or hold the power to reset. or just start pressing random buttons and after about a few minutes or so.. it'll start working again.. I noticed it since updating to 10.6.3. It's really annoying.. It's happen maybe 10 times already..