Car door protection - BobbyG
I like my car accessories, and I like trying to protect my car from dents by parking as far away from other cars as I can but I just cannot see me ever deciding I want a set of these

tinyurl.com/dllws9

OK, maybe if car was to be parked up in an airport car park for 2 weeks but everyday use down Tesco? I don't think so?
Car door protection - Alby Back
Not sure why but these make me think of the huge padlock on Mr Bean's Mini.
Car door protection - Bill Payer
My idea is a couple of inflatable tubes, joined with ropes that you'd throw over the car on leaving it.

However 2 of our cars have nasty dents high up on the rear doors which must have been caused by 4x4 rear doors being flung open by kids - no idea how you could guard against that.