http://monkeyspoon.com/?page_id=197#Clough_ZipLineTheres our first version, seems ages ago now.
Check out the impressive riding by me in the blue top on the Raleigh .

Our second version was a failure, well my part wasn't, it was the motorised drive system that failed.
I've been tasked with making version 3 over the winter, so just thinking how best to do it.
In terms of have a mounted camera rather than a person on the rope, you have the following options:
Digital camera or camcorder.
Self contained helmet cam.
Helmet cam and media recorder.
Camera with wireless transmitter, and receiver and recorder on the ground.
Also you run the risk of whatever you use getting damaged or broken, DVD and HDD camcorders being particular sensitive and not suitable due to the vibration that will probably be produced.