I just upgraded my 12" PB to 1.25GB RAM, using Kingston valueRAM from newegg. I didn't notice any significant performance leaps as of yet, but everything seems to work fine. Some people told me that valueRAM might not be compatible with certain powerbook models, so I ran a RAM testing program called "Rember." I just double-clicked it and it started along, and there were no problems reported. Is there anything else that I should do to test the RAM? I want to make sure that it is functioning perfect in case I need to return it. Thanks!!