Just thought I would drop a line about this guy.
If you are misfortunate enough to have to do some HTML programming of any level that is more than basic, this toolbar alows you to modify a bunch of things about your page and see how it's buit.
Finding it very useful.
http://www.microsoft.com/downloads/details.aspx?FamilyID=e59c3964-672d-4511-bb3e-2d5e1db91038&displaylang=en
