Today a friend stumbled across Frank Zhaos Picopter project that is documented at http://www.instructables.com/id/Picopter/. The project basically consists of two PCBs, one is used as base station, connected with a Wii-Controller and via USB port with the PC. The other one is the flight modell, the "one-hand-sized" tiny little quadcopter. It looks like the ideal toy for kids up to the age of 40++ ;-).
The RF link between the Picopter and the base station is realized using
ATmega128RFA1 driven by uracoli-code.
The Picopter has a lot of advanced technical gimmics like random
RF channel selection and sensor data transmission to the PC, but I don't want to repeat Frank, better watch his video on youtube or here.
I personally like this project very much, and maybe once a day there will be a swarm of Picopters showing interesting flight manoeuvres.