Ok here's the setup: I have a 12'' Powerbook G4 867 MHZ with currently 640 MB of RAM while using 10.2. I've had since the summer of 2003 and it's been a great tool and lately I've been using it more on a everyday basis (partly b/c my PC has been acting wonky...possible video card troubles). Lately though I've thought about getting more RAM up to 1 GB. Since this is my first Mac I've owned plus never buying RAM for my PC neither (something I want to do too) is there anything I should look out for? What type would work best with my current laptop? Suggestions?