I agree that ignoring rude comments from drivers would be a good idea, but it's easier said than done! I do use sarcasm with people and that often works, afterall, they're quite often still sat in their cars as I continue my journey home.
I know it won't stop ba driving, but I like the idea of having proof is someone does something very dangerous or just to laugh at when they get all irrate for no particular reason! Maybe the presense of a camera will make me more chilled about it, afterall, I don't want to sound like a lunatic!
I have read most of the cyclecraft info and do already adhere it, but no-one is perfect, our judgement can be a little off from time to time.I do think that if a camera is visible it will make me cycle more defensively, I think people are less likely to be abusive for the sake of it they know they will be on film looking like numpties.
Some good looking cameras mentioned above, but a bit pricey, although i do like a nice gadget! something else that has it's own charger and cables to go with the hundreds I already have!