Around two and half years ago I heard about microformats for the first time while at Parsek, from Mr Fry, right after he returned from the @media 2006 event. Ever since I have been finding places where to put them in use. Currently I am employing the following microformats on this web site
It is now easier, at least in theory, to employ widgets, for example inline Google/Yahoo maps to use with geo. Brian Suda has made cheat sheets available.