Hi I'm using panther on a 466 clamshell ibook and it works like a dream. MUCH quicker than jaguar was. The main difference I've noticed is startup time and application switching getting quicker. My new g4 14" ibook is pretty cool too though... I can understand your excitement - I was a nightmare for my better half till it arrived and then I stayed up all day fiddling before a night shift. Oops. Matt