I found this neat little wapp on the del.icio.us makemagazine rss feed, it’s called Mappr, and it superimposes pictures tagged with a keyword of choice on top of a map of the united states.
It uses other tags to place the images.
For example, i’ve tagged some of my images on flickr, which happen to be tagged with pug, ALSO with the keyword of neworleans. Mappr can then associate ‘neworleans’ with a location on the map. In essence, it’s inferring location from tags, which is neat.
To see it in action, check out this link