Automatically blocks popups
Automatically blocks ActiveX controls
Smaller, lighter, less resources, faster, it better supports web standards like XHTML, CSS and more.
It has cooler plugins too. RSS feeds. And of course the all powerfull tabbed browsing schema.
Lemme say this, you hop in IE, and go to a page, a virus gets put on your machine whether you like it or not. Just by going to the page. That is IE.
Though Firefox be praised, I actually use Avant.
www.avantbrowser.com. It is also small, fast, less resources, blocks popups etc... It is built on the IE engine so basically it can do what IE can, but it is a shell around it. Hard to explain, but I like it much better then IE, even then Firefox, mainly due to better, in my mind, handling of tabbed browsing then FF.
The other cool thing is that, unlike IE, these can be UNinstalled and removed. For updates or problems etc... But MS thinks nobody should be without IE, and thus you can NOT fully get rid of it. Or really fully reinstall it when corrupted.