Adsense is the best revenue income program running online but as others only a small group get enought from it ,i love signature campaings that allow anyone to make a good income without need others and rules to make money.
It is not the small group gets enough money but one need a special skills to earn money from adsense. After creating your blog or site you should do the proper SEO for your blog to push up in google search engine to get free traffic. This traffic will get you clicks and money.