If you haven't ever played with Firefox, I highly recommend you find out what all the geekfuss is all about. Firefox is one of the most powerful Mozilla-based browsers created, and version 3 is just around the corner! In preparation of stamping out the last few remaining bugs of the new release, Beta 5 of Firefox version 3 has just released, and you can grab it here!
I played with this build a little bit last night, and it is surprisingly polished and responsive for a beta release. While IE7 is certainly competant, Firefox adds tons of great tweaks to the web-browsing experience, all in a stable and largely compatible application.
What is your favorite browser of choice?