I had 1GB RAM installed on my PB for the 2 years I've owned it and always wondered how much difference it would make to max out the memory up to 2GB. It's made a huge difference! Before, I would frequently have >100 MB of memory free with 5 or 6 applications open and got spinning beachballs all the time. But now, I barely ever get them. Changing tabs on Safari is almost instantaneous, even when 3 or 4 other pages are loading at the same time in different tabs. Just thought if anyone was wondering the same thing I'd let you know, it does make a huge difference!