I prefer FireFox. Never tried any of the others except IE which always pissed me off because I found that I got more Viruses from IE then Firefox

IE 7 ; i think this is the best so far

I prefer using IE - personally dont like Firefox, rest didn try

I recommend you try Opera if you haven't yet, you wont be disappointed

I use Firefox and sometimes Chrome. Haven't used IE in a very long time.

Been using Opera snapshots for years, 99.915% of the time in linux (yes.. dont use windows...)
the usual bugs since ever: 100% CPU, flash plugins, lack of feature (read: sites not working has they should), keyboard keys "k" "i" "l"x2.. getting ware out, but still using it....

sadly they are making a circus out of it, introducing useless features, but still using it...

Firefox + AdBlock Plus and I've never looked back since

I use both IE8 and Firefox.

i like opera's polished ui and mouse gestures(saves time)
i also have ie but rarely use it for sites that do not support opera