Ok, I totally resisted but finally am making the switch. I downloaded Firefox at work, and am planning on updating my home browsers tonight. That's it - I've had enough of worrying about security crap w/IE. Done and done.
If you use bloglines - there are some very cool extensions available for Firefox as well... install it and check it out for yourself!
You can also add some neat search engines like IMDB and A9 directly to the Firefox toolbar which is pretty slick.