About.com

About.com offers a freelance writing program for serious writers. You can sign up to be a "Guide" in a number of different areas of expertise and then manage a "GuideSite" on that topic. To see if you qualify, there is a mandatory training program for new Guides so that you can show a sample of your work. Guides earn a minimum of $725 per month writing for About.com, with the amount increasing as you publish more content and get more pageviews.