Hey Graham, I thought about those systems, but wasn't keen on wearing the hard drive, or strapping it to a bike that could, uh, get launched backwards into a white tire wall in corner two at Mosport.
I have two of these:
They are stand alone cams, with a slot for a 1G SD memory card and 4 'AAA' batteries. 1G will hold 1 hour of video, and the (good)batteries usually last that long as well. Sound sucks, as you must have heard from the videos I posted. I reduced the sound quality to bring a couple of the vids down to the 100mb limit, but it's not much better right out of the camera. I've tried epoxying the mic hole on both of them, and it helped a bit, but it still sucks...For $100 each(a couple yrs ago), I thought it would be cheap and fun entertainment. Too bad they don't make them anymore. I have one mounted up front on the right side fairing, and the rear is on top of the tail fairing.
Hook yours up for the Romp. I'm sure it would be much better video and audio than my setup.