Just found a review on this and I figured I'd bring it out of the ether:
http://www.biketrailershop.com/blog/2010/11/new-ridekick-trailer-video-review/
I was never a huge fan of the pusher trailer idea, but I got to say that the design has really won me over. It's suppose to go for around 500 bucks, so if you could score one, swap out the battery pack, and drop in a brushless motor, that thing could be lethal... 8)