O'Reilly then: We're NOT looking for: Books that overlap too heavily with our existing books. Books on proprietary technologies that don't have a huge user ba

O'Reilly then: We're NOT looking for: Books that overlap too heavily with our existing books. Books on proprietary technologies that don't have a huge user base. Books on miniscule (i.e., personal or nascent) products, even if they are open source. Books on topics that have dismal sales despite quality books being available. (If you're addressing a topic where good books have sold dismally in the past (for instance, LISP, LaTeX, or Web-based training), you have a much higher threshold to clear with your proposal. Convince us why there is a revival of interest in your topic, or why your approach to a deadly topic will provoke interest nonetheless.) Books that have been rejected by other publishers, in most cases.