Free Firefox extension CSSViewer.
CSSViewer can let you check your web-pages CSS settings in real time, just hover your mouse cursor on whatever object you’d like to know.
I use image from Simple By Design website.
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Opera had this feature for years, with the WebDev Toolbar (Display / View computed CSS for elements).
(just a free ad for the fastest browser on the earth!)
For info, the navigation links are too high (displays in the menu bar) when viewed with Opera.
I was browsing for some new hype / web 2.0 theme for my blog, yours is of some resource about that, thanks !