At some point, I think Ardour deserves a book that would be on shelves at Barnes&Noble and other places. It could be a straight copy of the online manual (similar to how you can buy "Dive Into Python" at B&N even though the text is freely available online).
It's probably too early, since there are so many fundamental features still in development. But it'd be a great way to spread word of Ardour and could potentially bring in a TON of new users(and possibly convert them to OSX and/or Linux if they see Ardour as a killer app). Maybe even include the OSX and Linux version on CDs with the book.
I nominate Dave Philips as the best man for this job...... :-)