I went though a phase of using Firefox, then I went to Chrome and now I'm really liking Safari 4, even though I originally hated it. I find it the quickest browser, though I do have a soft spot for IE8 too.
I have been using Firefox for years now, and before it was firefox I used Netscape. I only used IE if I had to, now that 99% or more of sites use Firefox with no problem I just stay with Firefox, in fact IE is not a option on my computer any more as I got rid of it, well I got rid of it as much as what Microsoft will allow you too.
I have used IE8 just to have a look, but it don't do what I want from it and the stuff it have got I don't want.
Opera is ok, but I don't like the way it handles cookies.
Chrome is ok, but a bit basic and it is Google, so trusting it not to send all my browsing to google is hard.
Safari is great on the Mac, it is good on the P.C, but like Chrome it is to basic.
Firefox allows me to add things to it, some I can't be without now, I know Firefox got it's faults, like being slow to start up, but I think it is the best browser out there at the moment.
Adrian using Linux on his laptop and loves it.
BTBroadbandanywhere type package.