Thanks for posting. I am listing a car on CL this weekend and will make sure I ask for cash only (we are asking $500 or best reasonable offer - so there shouldn't be too much of a problem with cash). My DH will be around for the weekend, so if we get any offers, he will be there with me.
Great idea taking pic of their license plate. I always take pic of MY plates and keep on my cell phone just in case my car is stolen I can report the plate # to the police.