The camera is one of these:
http://www.vio-pov.com/products/pov_1.php
It was mounted to the LHS of my helmet with a mount they supply.
The recoding unit was in a Kriega day sac on my back.
It records to SD card (roughly 7 hours on an 8G card).
The unit was battery powered, but you can now get a battery eliminator to run it off 12v supply.
The unit has a wireless remote control:
which was velcro'd to my brake reservoir so I could record and stop easily on the fly.
The camera works in two modes.
1 - Just like any camera, Rec starts recording, and stop stops. Rec also "tags" the footage so you can easily find that spot later when reviewing/editing.
2 - Loop mode. The camera constantly records in a loop (so overwriting itself) and when you press Rec saves a pre-set time both
before and after the button is pressed. So the loop mode is ideal for say green laning where someone lobs it in front of you, you can press record and you have something that already happened captured, whereas on a traditional camera you would have either missed it, or recorded hours of footage to get that one event.
Editing was Windows Movie Maker (it looks better on the original, YT buggers up the screen shape etc)