A website and database where businesses rate their customers
 

Found this while searching an idea. Rate My Customers, Finally, a way to report your bad customers and let other businesses know about your experience with a customer. Rate Your Customers

About time although I guess they've been around awhile. Seems like less than 100 are listed and the comments range from silly, stupid and outrages to some that seem reasonable.

I've been wanting to see something along these lines for quite some time, but this site ain't it.

Entertaining, though.