Free Classifieds are another way of advertising your website. Google Adsense accepts this method as bringing targeted traffic. I am trying to compile a list of sites that spread the ads onto thousands of websites in their network. For now, you can start with the list below. If you're not sure what category your website should fall into, try the Announcements or Services categories and see what's listed there. Free ads usually expire within a few weeks, so you have to keep going back to place the ad again. Ignore the banner for the jeep classifieds, unless you really do have a jeep to sell. I got that one when I signed up for something else. I'm not quite sure what to do with it. Definitely join Adland Pro below. I have already gotten results from it. You get a page to promote and when people sign up, they get a page with your link in the corner. They also have a traffic exchange where you get 100% of the credits surfed by your referrals for 6 levels.
Here is an FFA page from a program that I just joined called ClickMyAd. It works like Adsense but the advertisers pay for clicks only, not impressions. This means that you can put these ads on anything that you want and advertise them in Traffic Exchanges or anything else.