(not cyclocross race related I know, but for road training)

I highly recommend this podcast, interviewing Josh Zisson an attorney in Boston, with his own practice specializing in bike law: http://www.thepodcasthost.com/thesprocketpodcast/2012/01/08/447/

(and see his web-site: http://bikesafeboston.com/ ).

Josh recommends that all cyclists use 2 cheap "police body camera" style video recorders; with one facing front and one facing backwards, whenever they ride. These simple flash memory video cameras can record a days worth of video, and you would simply strap it to your helmet, jacket, and/or backpack; and use it as a daily commute recorder. If nothing happened that day you could erase the memory (or allow the camera to continuously over-write the memory) and go about your day. However if a car hits you, you will have it all recorded.

Josh Zisson mentions that this video evidence is key in getting a fair settlement from the motorist's insurance company to cover your rehabilitation costs.