Writing programming books

 Petzold writes an interesting blog on authoring programming books. 

I agree 100% with him, you do not do it for the money. I co-authored a book once and did not receive a dime, not one dime, for my efforts.  In fact, I get paid more to do a technical book reviews for Addison Wesley then I did to author this one.  Oh well. I am not complaining as I enjoyed the experience.