This looks like a really old post (I mean, it's from 2007 for goodness sake). Stay for the retro vibes but be aware any information in this post is likely way out of date.

WebCards is the latest browser extension which takes advantage of microformats. Built by the chaps from whymicroformats, it exposes microformats embedded in pages - events, contact details that sort of thing. It is still in Alpha/Beta at the moment, but you can sign up for notification when it launches (initially for Firefox) - though I wish they’d get rid of the annoying pop-up about a license requirement just for viewing an information page.

With Firefox looking to embed microformat support in version 3 and Microsoft also taking notice, it looks like this small but powerful tool is about to get a lot more attention.