For you developers out there troubleshooting CSS, Aardvark is an extension for Firefox which greatly helps troubleshoot your css since it will show the elements with labels. Aardvark is not listed on Mozilla’s official list of extensions which typically means that the extension is not completely compatible with Firefox, sloppy, or the developer just didn’t submit it. I like Aardvark but had to quit using it when Firefox released version 1.5. Only today did I realize that Aardvark had a new release.
I definitely recommend adding Aardvark to your list of development tools!