Chinese Jetpilot has a great Tribute to stop-motion master Ray Harryhausen page up. You can browse and view short clips from the films he provided special effects for. I highly recommend this site to any Harryhausen fan.
"Groundbreaking visual effects designer Ray Harryhausen refined and elevated stop-motion animation to an art. His Dynamation technique of matting animated creatures into live-action settings revolutionized the use of stop-motion animation in visual effects."
"Ray was a master of his medium, applying skills as diverse as sculpture, illustration, painting, optics, history, and acting. Take any of his best-known creatures - The sword-fighting skeletons in Jason and the Argonauts, the Cyclops from The Seventh Voyage of Sinbad, or Clash of the Titan's Medusa, for example. Ray conceived and designed each shot; sculpted, cast in latex around an articulated metal armature, painted and detailed the stop-motion puppet; staged and lit a miniature set of his construction; and infused it with poetic animation. Lacking any practical pre-visualization tools, he knew if a shot succeeded only after the film was developed. He executed his shots single-handedly, working months at a time, in tiny converted storefront studios."