Also, woot Opera. I really do feel it could be a dominant browser if given a chance. It has the best mouse gestures interface, built in torrent support, excellent dev tools, fastest js engine on the market, superb standards support, and a very sleek UI. Good to see it get some attention, even if it is a bit forced.
Aside from IE, it's a pretty open market for browsers and thus far Opera hasn't dominated.
Safari comes pre-installed on macs.
Firefox comes pre-installed on linux and was the first open source browser and was adopted by many for this.
Chrome is advertised all over Googles network of sites telling non tech people that they will see youtube and other sites better with chome.
Opera is just there and sadly forgotten.
Acrobat Professional had a full copy of MySQL included in its bundle, and there'd be a mysqld process running whenever it was.
When they switch to WebKit, they'll probably bundle their whole own copy of that too, probably via their Air runtime.
If you don't know anything about Opera, I suggest you install it and find out.