http://www.chrisblogging.com/freelance-writing-income-july-2007/#comments
Now, I'm not sure how long he's been doing it, but it looks like, from his comments, that he doesn't have any magic formula or secret website. He's using the same sites and competing for the same gigs as the rest of us (GAF, Journalism jobs, etc). I do wonder how many hours he gets to work per day though...