Sala at the Aharef blog has created a Java applet that will give you a visual representation of your site's HTML tag hierarchy. The graphs use colors to represent the different HTML tags (blue for links, green for divs, yellow for forms) that your site uses to lay out your content. It's a useful tool for seeing how your site is arranged. And, um... also how many tables you're still using, tsk tsk. For example, here's Webmonkey, which uses tables (shown in red) to place banner ads and nav elements on the internal pages:
And here's Wired News, which is built almost entirely with divs:
Test it out for yourself by viewing the demo and running the applet.
[link via del.icio.us]