Affiliate programs.

Affiliate programs or referral programs (also known as 'associate programs or 'reseller programs') are ways to get other web sites (especially high-traffic sites) to advertise for you free of charge. They include a link to your web site on their web site and only get paid an agreed commission when you make a sale as a result. You decide how much commission to pay for each of your products.

Good affiliate programs are almost completely automated and secure. One that is often highly recommended is TradeDoubler. For information about using TradeDoubler services click on their banner add below.