Google Image Search

Google have just introduced a new feature: you can now search by image - just load an image into the search box either by dragging it from a file on your computer or by entering an image URL from the web. For more information see: http://images.google.com/support/bin/answer.py?hl=en&answer=1325808   

I tried it with a photo of a seagull I took recently on Ballycotton Island. It correctly identified the websites where the image appears. It also produced a list of "visually similar images". Check out the bird on the lower right!