Visually exciting and useful? Google's image swirl

When I find a new visualization or graphically based tool on the web, I like to jump straight in without looking at what it's supposed to do, or for that matter, how it's supposed to work.

Google's image swirl is superb - so obvious, and yet very useful. Search for an image - e.g. Statue of Liberty, and it gives you a selection of stacked images, with each stack having a different image characteristic - aspect ratio, colors, light level (night/day), for example. Select one of these and you can drill down further until you can get to a range of images that all are pretty similar, jump back up a level if you still want to refine it. In the example above I've navigated to pictures taken at day that also have nice fluffy clouds and the Statue of Liberty (or some interpretation of it)