If you write your own original content, you can re-use it in so many ways.
For instance let's say you write a book, you can use part of your book as a series of short articles of about 500 words each.
You then distribute your articles to the most popular article directories such as Ezine articles,GO articles,I snare,Article base, etc
These articles (providing that you have a website) will bring you lots of potential visitors which could make you a lot of cash.
You could also turn part of your book into a free report that you can use to entice customers to sign up to your subscriber list.
The first thing is to create your squeeze page with your offer. You can do this for free at Instant Squeeze Page Generator .com
Then all you have to do is sign up to a paid auto-responder service such as Aweber or Get Response,
Copy and paste your free report into their system, and once again you could potentially earn a lot of cash.
You can also use part of your book as a series of email messages that you can also copy and paste into a auto-responder.
Put a few affiliate links into those email messages and once again make potentially loads of wonga