The owner of these sites is really a honest person and always gives back to his members.
1st - Opportunity Dock - $10 for a 6 month membership. Be active and get random referrals and cash. When you visit you will see members that have received this. Look out for wealth4you, that's me.
2nd - AddLadder - Free banner advertising
3rd - Live Link Surfer - Free live link advertising. See the clicks you receive. Top surfer has their links featured.
4th - Every Member gets Paid - Still adding content and will be launching soon. From my experience at Opportunity Dock, I highly recommend for you to join this one.