Making money online through Adsense and other ad networks

In case, you've forgotten or you're confused, Google still does not allow the use of any third-party traffic providers as it will not yield great results for their advertisers. If you

don't want your account to get banned, say no to any traffic exchange programs. Nuff said!

We understand that our publishers are always looking for ways to attract interested users to their sites. But using third-party tools or services to increase your site traffic may lead to invalid clicks or impressions and result in your account being disabled. For this reason, we'd like to provide you with some guidance about this.

As many of you already know, our program policies strictly prohibit any means of artificially generating ad impressions or clicks, including third-party services such as paid-to-click, paid-to-surf, auto-surf, and click-exchange programs. These programs offer incentives for users to view web pages or click on ads, resulting in activity that is harmful to our advertisers.

via Inside AdSense