Just a quick recommendation for a real handy tool thats actually part of a tool bar with all sorts of other handy features for Webmasters/developers. The CSS information tool allows you to highlight an area of a page and it will then display the associated css attributes, this can be a huge time saving when modifing CSS driven sites. The tool is for firefox and you can down load it as part of the Webdeveloper tool found here -
http://chrispederick.com/work/web-developer/
Great tool!
