so i'm thinking about upgrading the memory for my girlfriend's powerbook g4 12" - she doesn't seem to like to the MB's (the style, colour or design) and she perfer's her aluminum powerbook (we got it brand new for free, so why upgrade, heh) anyway, what is a good site to find memory for this machine? what type of memory do I need and what is the capacity for this baby? how many slots does it have? she doesn't do much on it (just surf, minor photoshop and imovie, and documents....she's got 512mb in there now - should I get just another 512mb or a gb? thanks so much! EDIT: Also, how difficult is it to upgrade the RAM on the Powerbook's? Similar to the MBP's?