I'm using Mozilla 0.9.2 full time now on my personal and work computers. Not to be anti-microsoft (I am already, what more can I do?), but because it truly is a better browser!
I was using OmniWeb on OS X and IE5.5 on Windows 2000. I'm addicted to the speed of Mozilla. OmniWeb will have to speed up a LOT before I go back to it.
Oh, and it's absolutely wonderful to have the exact same UI on both platforms. I don't want Mozilla to be any more Mac-like on the Mac. I want it to be the same as everywhere else. I didn't appreciate that feature at first, but now I do.