Just browsed through flickr's services, and found:
http://labs.systemone.at/retrievr
This nice litte gadget allows for retrieving photos by either sketching them or uploading a reference image. Fun, fast, and addictive ;)
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Welcome to the Semantic Web, flickr.com!
Now, this is really good news: Flickr is rolling out a new feature called machine tags that allows users to be more precise in how they tag, and how they search, their photos.
Machine tags are tags that use a special syntax to define extra information about a tag; they have a namespace, a predicate and a value. The namespace defines a class or a facet that a tag belongs to ('geo', 'flickr', etc.), and the predicate is the name of the property for a namespace ('latitude', 'user', etc).
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