since i upgraded to tiger (i got it last night at the launch) my cpu has been running at 100% pretty much non stop. at first i thought it was an spotlight indexing everything - it finished and then it stopped for a little while, and then right back up to 100%. I then thought it may be an application I am running that is having issues, so i closed all applications and have left them closed for hours now - and still 100% cpu usage. this machine is a 12" 867mhz Powerbook, with 640mg ram. Activity monitor shows plenty of ram that isnt being used, so it isn't a paging to disk sort of issue - I would imagine. The machine has been kept in a cool, room with airconditioning, and is well venilated (on a wood desk not carpet etc). any thoughts?