Google Chrome, Mozilla Firefox, Safari are all three very good browsers I must say, but Konqueror and Opera are not bad either.
I prefer Firefox for it's nice Add-ons, mainly Firebug. XD
Safari basically has all main feature Firefox has, also text-shadows and corner rounding, so a nice thing too. Chrome has a nice interface I noticed, don't really know about it's features though. Opera, even though it uses trident engine, seems to be nice too. It has an integrated irc client as I heard. Konqueror is simply an allround tool for Linux user.
Well, currently it looks a little like a fight between webkit engine and gecko engine.