Link building is very important if you want to rank well for competitive keywords. Back in July I mentioned a new resource that DigitalPoint came up with, in an entry I named Free Coop Advertising Network. This network has really taken off and I have done many test cases with it. Bottom line is that this network works well. Let me explain.
You set up the ads to run on your site and based on several criteria, including the number of your pages found in the Google index, you will get a fair number of ads pointing back to your site. This network works off of a weight system, the higher your weight points, the more ads you have pointing to your site with any desired link text or image banner ad you want.
DP recently added the ability to add up to five banners on one page, that means more weight for those who participate in this network. Of course he limited the number of ads to 5 and each additional ad is worth less. So if you have 3 ads, each worth 1 point, then you will have a total sum of 2.4 points for that page, it diminishes as you add banners to your pages. More on how this works at the forum post named Multiple Ads Per Page.
If you want to sign up for this network, please use my affiliate link, you see, he even programmed in referral weight. Cool, ehh? Sign Up for the Coop Advertising Network >>