Glad I found about Chris Pederick's Web Developer Extension. It's a set of tools that will run inside Firefox or Mozilla revealing the underlying structure of any site you pull up in your browser.

Some of my favorite things:
  • Displaying borders on table structure
  • Displaying borders on frame and iframe elements
  • Showing dimmensions of images on screen
  • Adding your own user stylesheet
  • Displaying stylesheets for a site within your browser

Now to find an IE version...