Photosketch: Internet Image Montage provides a simple way to make image composites by doodling a picture, adding labels and then letting the engine scour the Internet for suitable photos. Once it has found the most appropriate matches, it composites them together.
I can see lots of awful e-cards and Powerpoint presentations coming out of this, but it would be very useful for putting together prototype sketches for installations and services and it is a pretty remarkable bit of technology.
(Via Richard Banks)