Spottt is a way for you to get free traffic to your web site with out paying for advertising. All you have to do is agree to put other sites ads on your site and your ad will be placed on their web site. Your ad will get put up on other sites in the same niche as yours. It is a great way to start out an advertising campaign if you have very little start up funds. Why spend the money promoting a new site when you can do it for free with Spottt? source http://www.mfinch.ca/blog/free-advertising-for-your-web-site
AdGridWork is another option you might want to check out. They are text links instead of image links so i would be a little careful with adgrdiwork.