Hey MeistersSinger, thanks for the tip. It was definitely impressive, but a pretty limited set of images to test with. Sounds a little like the altavista technology. For an example try an image search for horse. I checked the alta vista search.
Similarity is based on visual characteristics such as dominant colors, shapes and textures.
It's interesting, but I think they're only matching similar color histograms - kind of crude. It's a visual search, but doesn't seem to use shape or texture, only relative color proportion. The evisionglobal demo I saw ranks so far. It's a cool idea, though I found it kind of weak, like Meistersinger implied. I liked the idea of searching by object regions, which seems to cut through some of the limitations at Altavista.