By rapidly shifting the perspective on these images, your brain interprets them and you see them in 3-D. (thanks to www.voltier.com/stereo/) Pretty neat!
This same effect has been acheived in Flash.. I'd link the original site here but the site contains nude images. You can see more here tho: http://www.cockeyedcreations.com/Cockeyed_about-us.html You can see how these are created here: http://3dculture.com/occ/Panoram_time4space_wiggle.htm