No, make that three. I’ve blogged before about the excellent firefox web developer extension – anyone doing web development should have it installed imo. Today I happened across two other most excellent tools. First, check out the Mouseover DOM inspector, a bookmarklet (favelet if you’re an IE person, though if you are I’d be surprised to know you’re doing web development) that works in most of the major browsers and gives you a fabulous tool to look at the structure of your pages. This is the most comprehensive tool of this sort I’ve come across. Even so, aardvark is also worth a look as it enables editing of the reviewed content as well as a slightly less robust exploration of the structure if the page.