Stoopid Buddy Stoodios made a video to teach you stop-motion! Check it out:
"This two-hour instructional video will give you an exclusive opportunity to learn stop-motion character animation from the award-winning team that brings you "Robot Chicken!" Whether you're an animation student or hobbyist, this well-rounded introduction is the perfect tool for taking your animation to the next level. Topics include frame rates, basic physics, walks, performing with a character, and animating to dialogue."