I used my DroidX camcorder app to take this video - it's like 49MB in size. Crazy.
Below is the latest incarnation of the Schlaboratory Power Supply, incorporating Pololu motor control on the good old Radio Shack 276-150 PCB. 417, natch. I used this power supply with my lego / Basic Stamp robots and it performed very well. It has integral ports for powering servo motors and supplying a logic control signal. Vin could be anything between 7 and 20 (some say 35) volts. I'm using a six-pack of 1.5V C cells to provide a nominal 9V. 9V out to Arduino module (which has its own on-board voltage regulator), the 5V from this power supply is for Pololu logic power, servos, and the breadboard. The 7805 voltage regulator wastes the excess voltage as heat, but is simpler to implement than a switching regulator. Good enough compromise for my nefarious purposes.