What is an Affiliate Program?
It is a program where you will get paid when one of your website visitors does something.  Usually the action required of the Visitor is for them to buy something.  The Amazon Affiliate program started out as a program where you could talk about a certain book and then if your Visitor goes through your link to Amazon and buys the book you would get a percentage of the sale.  There are thousands and thousands of affiliate programs out there.

Single Pay vs Recurring Payment Affiliate Programs
A single pay affiliate
Google Adsense

Recurring affilite payment plans
1 way links

3 way links

Site Build it

Many Membership sites

Link building software from Josh?

Jonathon Leger page building software?