yesterday i stumbled upon a cool extension for Firefox / Flock browsers to display microformats contained inside a page:

the plugin scans your currently viewed page in your browser and displays a small, green icon (flocktails icon) in the bottom right of your browser if it has found any of the supported microformats inside the page. If you then click this icon you get a topbar in Flock or a ovelay in Firefox which lists all of the microformat elements it has found:

to see it in action try this link