I've kept my Mac on for days in order to test out these memory leaks that Safari, iTunes, etc supposedly have. Safari is now using 1.01 GB of memory. And that's not from having 100 windows open or anything. I usulaly have a few windows open with a few tabs each most of the time. But it's just the size to which Safari has grown. It started out much less. Under 100mb I think. iTunes is up to 280mb from 50mb and I believe it was even higher earlier in the day somewhere in the 330mb range. I have 4 gigs of RAm on my aluminum iMac, but now I have only 58mb of free memory left!!! When memory runs out what will be the result? Is Safari just using a gig of memory because it can??? Will this slowdown my system? Or will Safari and/or iTunes give up memory starting with the oldest data first? Am I reinventing the wheel here? What will this test or observation prove? Updates to follow.