A while back before Yahoo! provided reverse lookups of woeids (ie from long/lat to woeid) I created a small hack using Placemaker parsing of micro formats to provide a reverse lookup service. When PlaceFinder was introduce in 2010 my hack became obsolete. I still kept the web service I created public. Now nearly two years after the release of PlaceFinder I will close down this service on the 1st of March 2012. I would recommend all the current user of my service to either migrate to GeoPlanet or PlaceFinder.

Here is a simple Geoplanet query:

http://where.yahooapis.com/v1/places.q(41.13769 16.8380)?appid=[yourappidhere]

Here is a simple PlaceFinder query:

http://where.yahooapis.com/geocode?q=38.898717,+-77.035974&gflags=R&appid=[yourappidhere]