Send a Click, Earn a Penny
I believe the first affiliate program I had joined was the Pacific Coast Feather Company banner click program. They would pay you .01 per click for everyone you sent to their web site, through one of their 468×60 banners you placed on your site. Unfortunately payment was sent at $100. A bunch of my webmaster friends thought it was the coolest thing to start getting paid just for sending traffic to a web site. At this time .01 per click was a decent amount, though no one I knew ever got a check, since you had to send them 10,000 clicks to meet the $100 threshold.