Author of Beginning ASP.NET MVC 1.0.
I write technical books and articles as side work, which means I write when I can find the time to do it: I never write the book or article in a linear fashion from the beginning, but I prefer to take random notes on the topics of the various sections of the book, and expand them later.
Scrivener is way superior to a traditional word processors because it allows this workflow: taking notes and keeping them organized inside structure of the book. I struggled with Word to try and achieve the same result, but now that I found Scrivener I’m going back to a traditional writing software only when I’ve to fine-tune the styling of the text before I send it to my editors.
I think more technical writers should use it.