Yahoo Publisher Network

Yohoo Publisher Network is an advertising progarme.  This works just like the Google Adsense and allows you to put advertisements in your content.  You will be paid for each click and will get paid by Yahoo.  The below infomration extracted from Yahoo officail website and hope you wil find it useful,

Generate additional revenue by displaying ads related to the content on your web site.

Benefits
* Increase your revenue by monetizing the content of your web site.
* Satisfy your users by offering them ad content related to their interests.
* Leverage our knowledge of how best to optimize your contextual advertising.
* Get paid quickly via a convenient PayPal payment option and earn a return on the money in your PayPal account by depositing your funds in PayPal's Money Market Reserve Fund.

Features
* Advanced ad targeting and display capabilities can improve the relevance of your results.
* Ability to filter competitive listings from appearing on your site—to protect your business.
* Access to a wide range of tools, services and programs that enable you—and your users—to get the most value from your site.
* Four ways to collect your revenue, including a PayPal option that lets you get paid more quickly.