Making money with referrals means that when someone signs up for the program then you might be able to earn something through their efforts, or get paid something when they sign up. They more people you refer, and the more they do whatever it is they're supposed to do (read emails, etc.,) the more you make..

• Sitesell - one of the better affiliate programs on the web. They provide lots of support and have great products.
  
  
• Refer a friend to LinkShare and earn revenue through email, textual, banner & newsletters links placed on your website. Linkshare partners with hundreds of merchants making it quick and easy for you to find a perfect match for your website.

• SFI - SFI has an excellent FREE internet training course on how to get started on the net. It talks about getting leads, advertising in ezines, using classifieds, and much much more. If you are good at marketing/selling you can make money with them. Like any affiliate program it really helps if you're able to train and help the people who join under you. To advance you need to buy products and get others to buy their products. If you, and everyone, just go the free route, which you can, then where's the cash flow? If you follow the training then you might do very well. [Worldwide]
  
  
• Trafficology - Trafficology.com sells various things like advertisements, special reports, back issues, traffic software, etc., in addition to its book on traffic building ideas for your website. By linking to them, you'll receive 1/3 of every sale.
  

• Turn your traffic into profit with Commission Junction. Like Linkshare.com, CJ partners with hundreds of merchants, many of whom will be a perfect match for your website.
  
  
• AssociatePrograms.com - You can earn commissions by referring customers to other web sites. This directory gives you hundreds of programs to choose from. The author puts out a terrific email newsletter which will keep you up to date on affiliate programs.
  
  
• Also check out lifetimecommissions.com for affiliate programs that pay residual income
  
  
• Resource-a-Day - Get $10 for signing up. Get paid to get others to subscribe. Sends out useful emails. [Need to earn $50 before cashing out.] [Worldwide]
  
  
• Refer Central - Many paid programs to join; Get 1126 referrals for your get paid programs FREE! [Worldwide]
  
  
• Ebates - Earn $5 per referral from Ebates [Worldwide]