I just bought a Ibook g3 500mhz. The specs are 10gb harddrive, 128mb of ram, air port card. I hear the maximum amount of ram the machine can take is 640mb. So I could only put a 512mb stick of ram in? My plans for this machine are word processing, and surfing the net. Will this machine be able to play youtube videos, and possibly online game like from pogo.com? What is the maximum harddrive in space and speed that I can buy for this ibook, what speed can it handle such as 4200, 5400, 7200 rpm? What version of Mac osx would run the best? Thanks!