Via Make - Here's a DIY project for making an in-car camcorder mount for video recording on the road.
He prices the materials - 2 feet of 3/4" aluminum or steel square tube, 2 u-bolts, 4 wing nuts for tool-free installation and an universal mounting screw (or a web cam swivel stand for lighter cameras) - at less than $US15.
Sounds cheap for being able to produce your own "Cops" style home movies, doesn't it?
It's totally handsfree, so shouldn't interfere with your driving. Might get some funny looks though.