Pos/Neg Rep system
Instead of the "thanks" system, I think we should have a positive or negative rep system.
Users with Neg rep would be pretty much ignored because they're useless.
This would also work with Buysell where the users feedback would also add to positive rep. Positive rep users would be easily noted as a person with good feedback, while negative users would not.
Of course, when receiving or giving Rep points, it would show who, for what post, and why. Stupid reasons like "he doesn't answer his PMs right away" or other useless reasons would be deleted.
It would show the positive rep posts on one side, and negative on the other, so it would be easier to search if that person had neg rep for buysell. Quicker than searching for the user in feedback.
Plus, it looks like a DDR bar with the red or green dots.