Some related posts from Technorati and Google.

 [Geobloggers.blogspot.com] geobloggers: If you take geobloggers as an example, you can use the API to download user submitted photos, notes and audio from around a location with no adverts and in the future this will extend to tour and guides. I can see how other companies could take a (good I think) business model of offering guides with a couple of adverts or premium paid-for content thrown in.

[Blog.flickr.com] FlickrBlog: A guy called revdancatt wrote a cool new website called GeoBlogging that lets you "geotag" your flickr photos, geotagging means adding longitude and latitude coordinates to the tags for the image. Then his website pulls in the images and overlays...

 [Steeev.f2o.org] EXCELLATRONIC COMMUNICATIONS: Geotagging Flickr with Google Maps ...: @Mark J: Yes this would be doable, though the "geotagged" link serves a purpose, not everyone uses GreaseMonkey, in fact im sure its a very small percentage of the Flickr userbase. The geotagged link connects the flickr image back to geobloggers.com, and shows the flickr user whereabouts on the map the image was taken, and also other images that were taken in the same vicinity.

Reflected tags on Technorati: Blog, Geo-tagging, GeoTagging, Geobloggers, Process, Gps, Geotags.org