If you have your own website, you should consider Google Adsense in your website homepage and content pages.
Google AdSense is a simple and easy way for website publishers to display relevant Google ads on their website homepage and content pages and earn money. Because the ads are related to what your visitors are looking for on your own website — or matched to the characteristics and interests of the visitors your content attracts — you'll finally have a way to both monetize and enhance your content pages.
Now, you can earn more by spreading the word about AdSense and Firefox through the Google Referral Programs.
By adding a referral button to your website, you can help connect users to useful products like AdSense and Firefox - while generating additional earnings in the process. If you're not already an AdSense publisher, you'll need to sign up in order to use referrals. Click the Google icon for full information and online application.
For Google Adsense resources click here to access the webmaster support center by Google http://www.google.com/support/webmasters/
With regard to the know-how and insider secret for cracking Google AdSense code check it out here http://www.clicksbucks.com/adsense_secret.html
Check out the Adsense Secret to see the real, recent screenshot of earning stats page. With Google's permission, the author Joel reveals how much he is making with AdSense. But they've asked Joel to keep details of CPM and CTR private, so he has blacked them out in order to comply with Google's terms of service.