I like it, but with it installed my ATi Tool gets buggy, and my voltage settings completely disappears.
If I go back with IE6, then ATi Tool is back 100% functional.
No, I don't get it, but I don't want to try and figure out why. So I'll keep IE6, un-used, with Firefox 2.0 as my main browser.
Oh, also, with IE7 installed my Natural-Selection crashes upon loading most servers (that's a Mod for Half-Life). Another reason for me to stay away from it. They (Valve) have released an update recently which was supposed to fix that very issue, and it did, but it only works with Team Frotress Classic and the original Day of Defeat as I tested them. On the other hand, it didn't work for N-S, which I play each days of the week and a lot during week-ends.
Strange ... how can it cause such bugs that aren't even related to web-browsing and affects other applications is beyond me, but hey, that's from Microsoft so anything is possible really.