Powers of Ten
The Florida State University National High Magnetic Field Laboratory has posted an incredible view of the universe in the form of a Java applet that begins at 10 million light years from the Earth and then successively zooms in to 100 attometers to show the quarks in a leaf near campus. You can view the animation in automatic or manual mode allowing you to step through the photos at your own pace. The only slightly strange element is the oddly rendered orbits of the planets and moon as you get near enough to "see" them.