I use Firefox, although I'm unhappy about it not being OSX native. it doesn't support the Services menu, which is a drag. I do like it other than that, especially some of the add-ons, like the RSS reader (Sage) and a little weather thing in the bookmark bar. it also seems a touch faster than Safari.
I actually like Camino better, but it has some funny screen-drawing issues, so I haven't used it in a while.



formerly known as etaoin...