The U.S. Naval Observatory Library features high-res scans of images from antique books dealing with astronomy and navigation. Wallpapers, ahoy!
ARTnatomy: Anatomical Basis of Facial Expression Learning Tool. See how all the different muscles in your face work. Flash interface; via Drawn!
"To dream of eating pancakes, denotes that you will have excellent success in all enterprises undertaken at this time." "To dream of lard, signifies a rise in fortune will soon gratify you." "Dairy is a good dream both to the married and unmarried." "To dream of seeing your thigh smooth and white, denotes unusual good luck and pleasure." "To dream of noodles, denotes an abnormal appetite and desires. There is little good in this dream." "To dream of seeing a marmot, denotes that sly enemies are approaching you in the shape of fair women." -- What's in a Dream? A Scientific and Practical Interpretation of Dreams by Gustavus Hindman Miller, published in 1901.
What are nudibranchs? Jewels of the sea. Page after page of photographs of these squishy hermaphrodites.
These images remind us never to underestimate our opponent. -- The science behind the art (.pdf). Fractal art by way of bacteria growin' in a petri dish. A few more images here.
The site design is somewhat unfortunate, but The Virtual Cave features lots of photos and information on, well, caves and cave formations. We've all heard of stalagmites and stalactites, but I'd never heard of cave draperies or cave pearls before. Then you've got your helictites, your aragonite, and your splash stalactites (found in lava tubes). And they've got a Show Caves Directory of caves in the United States that are open to the public, with addresses and contact information by state.
The winners of the 2005 Nikon Small World Competition are up (previous years going back to 1977 are also worth a look). Photomicrography produces some amazing imagery, giving us glimpses into both the inner workings of living things, and the intricate structure of nonliving things (just click "find all").