I have a small Road Hawk camera supplied by my insurance company, if I can't provide footage of an incident then my excess goes through the roof.
Is on continuous record so just loops over, it's got an 8gb memory card so will record most of a day. It's also got a memory button so if something happaens you can just store that scene.
I should really put a bigger card in but it's ok for what I need. I have been looking at getting one for my car too but I've just not got round to it.