The recent thread in the review section prompted me to make this suggestion for YT.
This would be good for anyone who sells or trades or is a breeder, or any other thing. I've done some trading at coupon sites, and they have a rating system called itrader (vbulletin forums). Anyway, it is a lot like ebay feedback. Here, look at a sample of the itrader ratings next to people's names
example of itrader rating Click on the number next to itrader and see the feedback that can be generated on a person.
This would be a great way to have a rating system.