In the history of the written word, there has probably never been a better or easier time to make money from writing, whether it's for yourself as a self-publisher or via blogging, or for other outlets. Since the beginning of the internet explosion, the need for good, quality content has grown right along with it.
Here's where I most often send people who're looking to add a little extra income from writing.
Blogging and Writing
For other extra income ideas, see Extra Income Resources for Teachers and Other Smart People.