The Dink Network

There are not as many bugs as some people state. But page rendering sometimes messes up (for example, IE isn't very good at the style defining language CSS, which is pretty much standard now), it's not extendable by much where Firefox is, it has a lot less options than Firefox, IE 6 doesn't have tabbing (which is a great advantage to browsing), its file manager... wait, it doesn't have one, and the developers don't listen to what the people want so much, where the Firefox dev team does.

Opera also seems to be good, and the best at page rendering (fully W3 standards compliant)