Here's one of the first test flights of the ArduCopter quadcopter setup, from team leader Ted Carancho. Try doing that with a Parrot AR.Drone!
This is using the ArduPilotMega hardware (APM board and IMU shield) on the original AeroQuad platform. The ArduCopter platform is in final design tweaks before it goes into production. The merger of the AeroQuad and ArduPilot Mega software is going well and a public beta is probably a few weeks away.
Great job, Ted!