Smithsonian Institution
Smithsonian: Science: Week of 11 19 12: Leggiest Creature in the World
The Illacme plenipes millipede is probably the "leggiest" creature in the world with 750 legs. This feature from the Smithsonian provides a video and images of this creepy, crawly insect.
Ducksters
Ducksters: Animals for Kids: Scorpions
All information about scorpions can be found on this website. These arachnids have eight legs, pincers, and a stinger on their tail that can poison.