<< Today we're happy to announce that we are adding support for the hCard microformat to Google Maps results. Why should you care about some invisible changes to our HTML? By marking up our results with the hCard microformat, your browser can easily recognize the address and contact information in the page, and help you transfer it to an addressbook or phone more easily. Firefox users can install the Operator or Tails extension; IE or Safari users can use one of these bookmarklets. >>

http://googlemapsapi.blogspot.com/2007/06/microformats-in-google-maps.html