Hurts your career if you write a tech book that gets negative reviews?
bootload: "... However, after reviewing other related books on Amazon, I've noticed that reviewers/customers can be merciless. This seems to be all the more true for programming books, perhaps because these books are generally expensive and disappointed customers tend to be more upset than others because of the financial loss. But also, perhaps, because programmers tend to be more critical in general - I'm not sure. ..."Take a look at how both the Django (Adrian Holovaty and Jacob Kaplan-Moss) ~ http://www.djangobook.com/ and HTML5 (Mark Pilgrim) ~ http://diveintohtml5.org/ are evolving. Both started online and have moved/moving to publication. The interesting bit is how the content is influenced by their readers reducing the chance of poor reviews.