BookDriveDIY looks like an ideal solution… but any time the "buy" page says "Call For Price Quote" you know it’s expensive.
I agree that a flatbed scanner is too destructive of your book. That points us to a digital camera. In your example
http://www.flickr.com/photos/arendle/122135090/ the recto (right-hand) page looks pretty flat. How about shooting one page at a time instead of two-page spreads?
My suggestion:
Get a piece of picture glass a little larger than the page. Make a jig to hold the book flat in one place and to support the other side at about 45 degrees. Position the camera looking straight down on the page, using a macro lens in the short-telephoto range. Cut a hole in a black card the size of the lens and affix it to the lens. Use a spotlight at 45 degrees off-angle to illuminate the page.
Shoot all the verso pages, then the recto pages. Shoot a page, lift the glass, turn the page, replace the glass and shoot again. Make all the exposures the same and test to make sure your exposures are right on. You should be able to shoot the book pretty quickly.
Tom Nelson
Tom Nelson Photography