http://velo-orange.blogspot.com/2010...dyno-hubs.html
Apparently they will be selling a hub dynamo that has a "clutch" that you can disengage to remove any drag normally associated with a hub dynamo.
Personally, I don't have that delicate of a touch that I can notice the difference between my Shimano Deore hub and the Shimano 3n-71 dynamo hub that I now use. I don't know if this is much of a game changer for me but it might interest those that can feel the difference.
However, the Cree based dynamo light sounds interesting especially at the price level of $60. If it is at or above the output of a Cyo light then that could be very useful. I guess it really depends on how the light is focused and what the resulting beam will look like.