You can use text link ads along with Google AdSense on your website or blog. It will not against AdSense policies because text link ads are not contextual ads, thus they can appear on the same webpage. To sell text link ads on your site, you can sign up as a publisher of a online company called
Text Link Ads (TLA) and they will sell text link ads for you through their system. Sales, invoicing and customer services are all handled by TLA. You earn 50% of the selling price of each text link sold.
The selling price of each text link depends on your website's or blog's Google PR and traffic, the more PR and traffic, the more money you can earn from TLA. So selling text link ads can be a great source of income.