If you’re a Firefox user (or any browser user for that matter), run, don’t walk, to download the latest Firefox 3 Beta. Damn, this thing is lean and mean. I’ve got my usual 40-50 tabs open right now and it’s consuming about one third to one quarter of the memory FF2 did on WinXP. Plus tab and new window creation is instantaneous, even after many hours of use. There’s some subtle chrome improvements too, including little things like smooth-scrolling tabs that prevent me from getting lost when I’ve got more than about 10 tabs per window; very useful for Wiki-despamming or reading developer documentation.