hcard
I've added hcard microformat markup to this page, so your semantic web applications can (with luck) discover contact information and such automatically.
To my surprise, though, I haven't found a validator, or even much software that seems to use hcard. So, I really have no idea whether this markup will work with the stuff people have in mind. If it doesn't, let me know.
(You might need to reload the stylesheet if the page layout goes awry)