I loaded leopard on my 12" PB, 1.5 GHZ and 1.25 GB ram, and it is running very poorly. It's quite choppy, distorts video content streamed online, and overall i'd say doesn't work as well as had expected. I'm thinking that I'm going to reload Tiger back on to my machine. Leopards great otherwise, really cool, a lot of new tools to make things quite a bit easier. Has anyone else encountered these problems on their G4's?