I strongly suggest posting on all of your 
auctions and your my evilbay page (if you don't 
have one create one) a link to your blacklist 
page and a page explaining any negatives you 
received. Also if you received any negatives, 
remember to reply to the posters allegations! I 
recommend putting the link in of the blacklist 
page. On the blacklisted page, I personally 
include their full name, their evilbay and other 
username(s), the item number (or item description 
if it's nonauction related) and make a link to it 
if possible, and any quotes from emails they sent 
you with dates and lastly, your valuable 
objective comments to the entire situation.

Deadbeats make the entire online selling 
experience extremely unpleasant.