For the last six months or so, my favorite browser has been a developer's preview of Flock, a sort of user-friendly front end for Firefox. It's now out in beta, and I can't rave about it enough. It is all about Web 2.0 and social networking and all those other buzzwords, and if none of that means anything to you, don't worry, Flock takes all the mystery out of it. It's just a more fun way to look at the web.
Small things, like having a constantly-updated strip of a Flickr contact's photos at the top of the browser if you like. Or being able to stash things for future reference, or even blog from within the browser itself. Or RSS made ridiculously easy.
Check it out. It's free and it's cool.