Maybe you should consider writting an "e-book" that would be distributed in Adobe Acrobat format and setup to NOT print. That way you could essentially keep it up to date ongoing. Mabye you could give purchasers an access code and they use a password of some kind to get the latest version. Just a thought. I think people would pay for such specific up-to-date advice. Just a thought - as if you don't already have enough to do.