I'm running firefox, sometimes safari, adium a word processor, sometimes itunes, yahoo widgets (about 4 of them), and one or two dashboard widgets. And Time Machine. My memory goes from about 1GB being used to 1.5GB being used, even though I've opened no other programs! So I'm wondering what's going on. I'm even surprised that a whole gigabyte is being used with light web surfing and a few widgets being open.