About a year and a half ago, I bought some RAM for my 15" PB. It was when the 1.25 model had just come out and the people at ChipMerchant weren't quite sure what RAM the machine would prefer. They tried some Kingston RAM, but I got all kinds of kernel warnings, so I took it back. They put some generic stuff in there and it worked like a charm. Fast forward a year and a half, and after I installed Tiger I got all kinds of apps taking longer to operate. Sometimes Firefox even crashes after that rainbow circle runs for a few secondsand I'm seeing that damn rainbow circle with quite a few apps. So I'm wondering if you think this is a RAM issue and whether or not RAM gets old or prefers different OS?