Sketch an image in the box provided on the left of the page, and Retrievr will fetch images from Flickr that matches your sketch!! Truly amazing. (Hint: Use different colors, and try to keep it simpler. After all it is a program you know)
Even more interesting is the way the logo and visual treatment match with that of Flickr. Yes, they use the Yahoo provided APIs to swing it. But with such a closely tied up hash, Yahoo has no choice but to buy them.