[ef4]

The DIY copter crowd does some pretty sweet stuff (both autonomous and piloted).

Here's a fun video shot by a guy who built a first-person-view Hexacopter: http://vimeo.com/18873955

[bri3d]

http://www.youtube.com/watch?v=hU0_tGHlR7g

All of the RCExplorer videos are awesome, and they're shot with a very low-tech drone (a tricopter with only roll/yaw rate stabilization - just piezo gyros and no attitude stabilization at all).

[bigiain]

This one caused a _lot_ of controversy in the FPV (first person view/video) RC community a while back:

https://www.youtube.com/watch?v=M9cSxEqKQ78

if you don't have the time/patience to watch the whole 3-ish minutes, try this but:

http://youtu.be/M9cSxEqKQ78?t=2m2s