This is a little “techy”, but I figured I’d share it anyway. You may have already heard about it on some other sites…
Google has a “labs” section where they try out new products. Recently they released something called Google Image Swirl. They are using some technology to “cluster” the images. Instead of doing a regular image search and finding loads of images that all look the same, on Google Image Swirl, they are grouped together. You have to try it for yourself to fully understand. I’ve included a screen shot below of my search for “niagara falls” (without the quotes).