Same here. Been using multiclutch for back/fwd pages in firefox: <a href="http://paulstamatiou.com/2008/06/16/how-to-quickie-swipe-in-firefox" rel="nofollow">http://paulstamatiou.com/2008/06/16/how-to-quickie-swipe-in-...</a>
I've been using this for a while. It's hit-and-miss (some programs don't let you change them, sadly) but what it works for, it does well. Very much recommended.