Learn to build the Supercap Racer Kit from the Maker Shed. http://makeprojects.com/Project/Supercap-Racer-Kit/1659/1
http://www.makershed.com/Supercap_Racer_Kit_p/mstin4.htm&Click=37845

Assemble the Supercap Racer kit and make a new toy that’s fast, unpredictable, and fun to build. Designed by George Albercook (founder of Rocks and Robots) and manufactured by MAKE, the Supercap Racer is a great way to hone your soldering skills, and have some fun.