Those look pretty cool as a concept, but the axle mount seems kind of annoying if you have to remove the wheel.

These seem a little better just because you can mount the lights up a little higher, but it's clunky, there are wires to run, and the standby switch design is really bad.

http://www.freelights.co.uk/

I think I will end up going with a bottle dynamo if I can find one for not too much money.