Haha. Go Internet Explorer! Hold out for Internet Explorer 7 people, hold out.
Anyway - if you have SP2 you have no Internet Explorer Security Problems. And Firefox renders everything so oddly; especially My MSN and other sites with WebParts. Then there's that it has a damned Google Search bar naturally. That's just nasty.
I have to say I like Firefox but prefer Internet Explorer as Firefox doesn't take to kindly to me websites. I have validated everything but it still puts everything out!