RE: The economics of writing a computer trade book
I found a good tidbit this morning (on the java-writers' mailing list) titled "The economics of writing a computer trade book." Good stuff to read if you're an author or wanting to be an author. Scott estimates the average payout for authors is $20/page for books and $50-$250/page for magazine articles.
Bottom line, write magazine articles if you're doing it for money. If you're doing it for fame, write a book. If you're writing a book, warn your family and friends that you'll be unavailable for the duration of your writing. Don't forget to mention you'll be stressed out, irritable and you'll bitch a lot that they're not paying you nearly enough for your efforts. Then plan a party when the book is released and give yourself (and your family) a pat on the back. I've been waiting to plan this party since March!