Yahoo! owned photo-sharing site Flickr has added geotagging to allow photos to be explored by place. The Ajax based interface allows users to drag and drop photos onto a Yahoo! Maps target to select photo locations.
Flickr has announced that within one day, there were 1,234,384 geotagged photos and 1.6 million by the time they blogged about it 9 hours later.
See my photostream, "Mark At Avondale" at http://www.flickr.com/photos/99118482@N00/