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...