Great - thanks guys! I didn't know if only businesses could use PayPal or just regular people too. That would definitely make me feel better, because then if the buyer is unsatisfied, s/he also has recourse.
I don't know that it's a simple matter of trust - I have plenty of friends that I would let use my car or ride my horse once in a while, but I wouldn't take their checks or loan them money. People don't have to be dishonest to bounce checks. Most of the time, I think, it's just bad financial management. It still makes a huge hassle for the person who sold something.