Perhaps we should have a forum visible only to members for vouche threads and such, as well as some sort of built in feedback called a trader rating?
So, you know, Dan gets 1 0 as his rating after the car, which is generated by a form you can fill out after doing a deal with someone, and this rating is displayed in their profile to faccilitate interwebsite buying/selling.
I think it would be a nice idea, and I could do some official vouching for everyone I've dealt with. Also, a little review of the transactions could be accessible upon clicking on the rating for further detail.
Thanks to Dan for selling his car cross forum and giving me this idea.