Crazyflie from http://www.bitcraze.se/ is also pretty cool. I own one myself, and I like it a lot. This is a tiny fully opensource quad which can be flown indoors. I think I'll add a camera like the post to make it FPV.
I'm wondering if it's feasible to use this cheap micro drones as a base to build an ardupilot.
Any experience about this ?
Some microdrones can be hacked to run custom builds from Multiwii code