I am a total convert to the "don't break the chain" idea. I started writing a book on game programming[1] about four years ago. At the time, I was working at EA, miserable, and highly motivated to have the book done so it could help pad my resume. I got a book deal (O'Reilly) then, when that fell through, another (Apress). I had a real writing schedule, and a very supportive wife, and I would work on it for hours at…
If you don't mind me asking - what's the point in writing a book about an area that you used to work in, but didn't want to going forward? (I assume you moved out of gaming if the domain was fading)