When promoting affiliate offers, just make sure you are fully aware of all the terms and conditions attached to your affiliate program. Some programs can be strict about how they allow you to promote their products. For example, some may limit you to banner ads and links only, while others will allow you to use paid advertising, but won't allow email marketing.
While passive income isn’t always easy to come by, it is possible to create residual revenue streams — even as a beginner. Remember, not all options will make sense for you. And chances are you’ll find one that sounds the most promising. Not sure which that may be? The best way to find out is just to simply get started. Many of the options on this list are free or at least offer a free trial, which gives you a chance to try before you buy!
Although this article has been written in 2007, now in Feb 2014, I still find it full of great advice and tips. What I learned from this article is that when writing a review I should focus on how this product helped me achieve X instead of simply repeating and enforcing the features and benefits of the product that can also be found on the sales page.