(and not just because one of my photos shows up as the default 'nothing' search)

Retrievr lets you search for photos by drawing a sketch. I've seen photo similarity searchs before, but this one's fast and it's tied to Flickr, which means that you might actually be able to use it as more than a toy. I've been debating whether or not to do another 100 photos collage this year. I skipped last year I skipped due to lack of photos. This year I perhaps have too many photos, unless I could have cool search technology like Retrievr built in to my photo management software.