Do you have a need for speed? Or just a need to run a couple of motors? If you combine that need with a TI LaunchPad, the Motor Driver Booster Pack from Longhorn Engineer might be just for you. It is open hardware, so the full Eagle sources can be downloaded.
What you get is a dual H-bridge motor driver, capable of driving 2A per motor at 2.7-10.8V. The logic voltage is 3.3V, so perfect for common ARM boards, but requires a level conversion to be used with the ever so popular Arduino.