Ad Exchanges
These are a simple concept, you post a text or html ad, then you click on other peoples ads to get credit for yours to be clicked.
Most of the sites listed below will give you a good amount of credits when you sign up to get started.
ADZolute Profit
2000 credits for joining, enter promo code TRAFFIC for bonuses.
Click here to join ADZolute Profit now
Cash Builder Ad Exchange
Use promo code "cash" when signed up to get
30 Solos
25 Banners with 5,000 Views
25 Button Banners with 5,000 Views
25 Traffic Links with 1,000 Views
25 PTC Links with 1,000 Views
25 Hot Links with 2,000 Views
25 Login Ads with 1,000 Views
5 Top Nav Links
5 Bottom Nav Links
100,000 Points to get you started.