Would be a money maker if you could find a cheap way of getting a big color coffee table Yo guide printed in the States or elsewhere (China!). Nice to make it a full multimedia production with continuously updated interactive links to topo pdfs and giant wall pics. Videos taken on the routes would be hot too. That way you could have all the advantages of a book and the advantages of Internet based information reinforcing one another.
To clarify my statement (woke up late with a headache!):
A big coffee-table text/graphics/image book linked to (and supported by) continuously updated online resources at a site with downloadable topos in pdf format and larger images of walls and areas too big for the printed medium all with gps coordinates you could access in the field from a smart phone. Of course, at home from a PC or Mac too.
A lot of big history and art books from publishers like Oxford University Press and eminent historians like Anthony Beevor are like that right now. More information and videos at the web site that didn't appear in the book.
Again, no easy project, but given current technology very do-able. Trip reports and topo updates too. The book could serve as a front for a sort of mini-Yosemite climbing industry. What about some funding from the AAC?
Also, lots of online videos linked to individual climbs to illustrate cruxes and belays. Even mo' work!