The InHouse Affiliate

Info Link basically puts ads in your posts. They usually have double underlinings on specific keywords and you mouse over the words a pop-up ad comes. A few bloggers have claimed to have made a few bucks off this service while others feel it is an imposition.
In my opinion if you are still starting out and do not have the patience to build up your traffic so that you can generate enough revenue from Adsence and other PPC's you should definitely go for it.

They normally take a day to approve.