I hardly pimp utilities in the forum (apart from 3D Exploration), but there's this really good program that I can't do without and I thought I would tell you about it..
I use both Internet Explorer 6 and Mozilla.. IE6 loads up real fast, renders webpages quick, but lacks some really useful functions like tabbed browsers, pop up blocking, flash/applets/javascript/sound disabling, skins, mouse gestures etc which Mozilla has..
Anyway, Avant browser is great because it adds all that new functionality (and a lot more) to IE6.. It's basically a front end, and uses the IE6 engine, so it's pretty small in size (under 1 mb). It's freeware too. http://www.avantbrowser.com/
There's a mozilla skin for it too, which I'm using. I've always loved mozilla's gui.
I tend to open a lot of browser windows, so I find tabs are a very useful feature to me. There's just so many other useful options and features too. Disable Flash animations (when you visit game websites, 99% of Flash animations are advertisements), pop up blocking (I *hate* pop ups, pop unders), disable sounds, delete cache and cookies when you close the browser etc, I find these features essential to have. Avant Browser is still pretty much IE, it just has a tonne of extra stuff..
There are others out there too, a friend of mine uses CrazyBrowser, and there's also Mozilla Firebird etc. I think the explosion of browsers comes form the fact that you can simply use the same control to display html and other documents that IE uses anywhere, so everyone is making their own damned browser.
Anyways I still like IE and use it because the tabs aren't really such a "brilliant" feature...