UPDATED 29 April 2011
I will try to keep this list as up to date as possible but if you could please help me in reporting these scams we can all work together to bring them down. Also if you happen to find any ads you feel are suspicious add them to the comments and we can keep a running total.
Most of these sites will have some sort of moderator or reporting link. The more people who flag each scam the higher the chance it will be removed!