Andy Mabbett recently added the geo microformat to Wikipedia's template system. Consequently, all Wikipedia pages that are based on this template do from now on contain geo. What's the benefit of all this? You might, for example, use the Operator or Webcards Firefox extensions to find a place in Google Maps or Yahoo! Maps with a single click. Other applications may parse a Wikipedia article and process the metadata in other ways. Examples: List of impact craters on Earth, Hamstead railway station.
Andy is a member of the WikiProject Microformats, a group of users who want to actively promote the use of microformats in the world's greates encyclopedia. Great job!