From CNet review:
....IE 7 was Microsoft's one chance to leapfrog ahead of the competition, but the company has only barely caught sight of the current front-runners.
That said, everyone should upgrade to IE 7 when offered the chance, even if you never intend to use it. Because Internet Explorer is so tightly bound within Windows XP SP2 (for example, if you view an HTML document in Microsoft Word, you're using IE technology), it's better to have the improved code within IE 7 running on your system than not. But for a truly secure Internet browser with more features, we still recommend Mozilla Firefox.
http://reviews.cnet.com/Internet_Exp...g=links;review
BTW, I use to 99% Internet Explorer, very seldom Firefox .. I am just used to IE.