Idly wondering if any of the three readers of this blog are authors, I whipped up a book template site yesterday. Actually, I built this for my mum, who's using Wikidot to write a book on the history of language.
Why use Wikidot to write a book? Mainly, because it lets others review the work in progress, join in as editors, and it means the text is safe from getting lost. On the other hand, Wikidot is not yet ideal as a book writing tool. No easy import/export to word processors, no print to PDF.