Just to be clear, the premise for that is so that we dont end up with what we currently have, something many have complained about.  By writing content for the book, rather than creating a book from existing content the hope is to get higher quality documentation.

As of yesterday the users guide has the most work done on it, which admittedly isnt much, but I just did that yesterday and was still trying to get things like a style guide done, and a list of what content needs to be written.