Read J.A. Konrath's blog, or pm me your email and I'll send you the ebook of his collected, organised advice on making money writing, with a strong emphasis on ebooks/the Kindle. It seems likely that ebooks are a disruptive innovation and at least the early adopters can take advantage of this.

Charlie Strosss' Common Misconceptions About Publishing may also be useful, as well as various stuff on John Scalzi's blog.

If you can write publishable fiction, you can write advertising copy. This is a relatively difficult field to break into, and at least at first the pay is abombinable, but if you can write it quickly and at reliable quality there is never ending work, and you can do as much as you want.