I have problems, usually in Safari, with the pinwheel/beach ball - I'll call it the pinwheel - It seems that I have to restart my computer ocassionally to get rid of all the 'stuff' on my RAM, otherwise I have very slow keyboard response, a pinwheel jumps in and I have problems getting sites to open. I upgraded my RAM to 2GB thinking that would help, but it doesn't. I think somethings wrong with Safari - because that's always where I have the pinwheel problem, otherwise, everything is OK. I watch the amount of RAM being used through Activity Monitor, and it always shows that, progressively, more and more RAM is eaten up as I remain on the 'new' restart. After a while, I have so little open RAM, I just do another 'restart' and have tons of open RAM.