I have a TiBook G4 1GHz with 512 MB of ram (2x256). I'll probably be seriously considering a MBP in 6-9 months, but in the meantime I was thinking about maxing out my RAM from 512 to 1024. Since I have to buy both sticks and I probably wouldn't bother selling the old ram, I figure it will probably be about $200. It's kinda sluggish but I don't lean on it too much. Typically I do some basic web, email, and office work with it. Sometimes I play World of Warcraft, although I usually do that on my iMac G5.