Here's an interesting one on ebay, where the seller asks that you contact him/her privately by email outside of ebay.  The email address is an image instead of text.
 
Listing
 
(Message edited by davehouck on May 24, 2009)

Same a%&hole has been running this same scam for several months now.  I turned it in.

Hi Alan; welcome to the board!
 
Thanks for posting the fraudulent listing!
 
We'll see how long this one lasts.

This one appears to be gone now.