1- Affiliate programs All you have to worry about is selling others product. Product owner will keeps track of the sales that you generate and issues you a commission based on a set percentage of the sale that your site made. They will send out checks every month or twice a month.
2- Sell a product membership. Try to think about the things people use every day or every month and have to continue buying. Selling a product like this, think of a realistic amount of time it takes to use the product and then set up a renewal system. Every time the customers need to renew, you get paid again and again.
3- Using Google Adsense. Created a Google Adsense Account and paste HTML code into your blog. Every time people clicks Google advertisement on your blog, you get paid. Commission depends on the ad and some have a higher payout.
4- Writing and publishing. Can do online or offline. A person writes a book or e-book and then sells multiple copies, making income off each sale. They only had to write the book once and they continue to make money as long as the book is in relevance.
Residual income business opportunity can be see anywhere. A member just needs to understand how to make residual income and look for a residual income business opportunity that really easy to do and not requiring hard work.

I recommend the following websites to learn more on Residual Income Business Opportunity at
http://www.residualincomebusiness.net/