Micro Power Cube

edit

Communications

I remember mentioning "brushless outrunners". A cheap source is Hobbyking (They also have US warehouses but it's not immediately obvious how to order from them):

http://hobbyking.com/hobbyking/store/__517__59__Electric_Motors-Outrunners_by_size.html

These motors have no mechanical commutator and need a driver:

http://hobbyking.com/hobbyking/store/__61__182__Speed_Controllers-All_Speed_Controllers.html

These RC drivers are controlled like any RC servo which means you can use the Arduino servo example to get started.