The key to build a site with AdSense that is profitable is finding a niche that is high payment, to me refieron with that? To the people in that niche are effectively paying for information. I wonder what these niches of high pay for make money online. Well, some profitable market niches are:-niche financial: loans, debt, bankruptcy, credit cards, taxes, debt – investment niches consolidation: FOREX, stocks, financial planning – niches related to Internet: domains, Web Hosting, antivirus, anti spam, development of pages web, design of pages web, wireless internet – travel niches: hotels, aircraft deals, holiday packages, timeshare, cruisers – car niches: Trucks, sports cars, SUVs, motorcycles – niches satellite and cable: cell phones, called long distance, ring tones, of course, AdSense sites require that the Ads are placed in a large part of the site. If your build an AdSense site, you can write articles that promote affiliate products, but real incomes will be AdSense clicks. Every room of this type must include at least 10 to 20 pages of solid content. Used articles, reviews and product descriptions to fill your page.An AdSense site is a very good option when the niche market in question has PPC, payments per click high (as in the niches you mentioned at the beginning). In addition, for content can outsource articles, or use PLR (Private Label Rights) more known as articles with resell rights, or better yet, if your you know the topic, write your own articles. But the content should not be a problem! Only a formality! Begins to generate extra income on the internet well, and you can also include AdSense ads in another type of site to earn extra income, but fret that these notices not distract visitors from the main objective of this site!