I know, I'm a bit behind the times, but I finally installed it to check it out.  If you haven't yet, and you're the sort of person who thinks they may someday make a webpage, you should get it. 

The features are nice. The spy++-esque features, such as highlighting objects in the DOM, etc, are especially useful.  And it provides a quick way to clear your history.

http://www.microsoft.com/downloads/details.aspx?familyid=e59c3964-672d-4511-bb3e-2d5e1db91038&displaylang=en