Noticed this while booted in Windows XP Pro with Bootcamp. Sometimes the touchpad it either unresponsive or it is "jittery". What I mean by jittery is the pointer is shaking back and forth. Usually if I wait long enough, it quits all this and goes back to normal. Sometimes I have to reboot. I don't do anything graphics or processor intensive in Windows. Anybody else have this problem? I have a MBP with the 2.13 Core Duo and 512MB RAM.