One of these days I'm going to catch my breath and explain why I think Facebook is a must-have application (at least, for right now). Scoble and Dare Obasanjo give some clue to this. Until that time though, I'm going to keep feeding Facebook odds-n-ends.
A Firefox extension was just released though that brings most of your Facebook functionality into a toolbar. I've been keeping Facebook open in one of my 3 permanent tabs. This toolbar gives me access to most of the functionality without the tab.