RAM hog. Doesn't seem to release active memory back to inactive memory real well. With only Safari running with two tabs, my RAM usage is at 4.18GB used/3.82GB free.
Ditto on the ram, got a 4gig Swap here with just basic apps running. I reboot every 5 days. The animations slow things down for high ram users too, its not smooth like a baby's butt.
It uses more RAM, but it's not like I'm paging all the time either, so it doesn't make much difference. I'll probably upgrade my iMac to 12GB just on general principles.