These is the are the first 3 of a 9 part video series from SparkFun where they be taking us through the basics of how Robots work and how you can build your own!
Part Two from SparkFun Electronics, Inc. Robotics 101 Series theydiscuss Angular motion. Good into to Motors.
Episode 3, they discuss linear motion and how to implement it with Actobotics parts. {this video seem more about Actobotics parts }
Look like Sparkfun is now selling Actobotics from ServoCity.
Link list