Every book on Amazon that does NOT have a Kindle edition has a link that says: “Tell the publisher! I’d like to read this book on Kindle”. It’s on the left-hand side, underneath the book jacket. Click that link and (supposedly) Amazon sends a message to the publisher. That’s it - you don’t even have to have an account.
So why don’t we harness the power of the Dope by listing our favorite books that haven’t been digitized, “voting” for everyone’s choices, and nudging the process along? To keep things interesting you can also explain why you like your book so much and why it deserves to be more widely available. Be sure to include a link (duh), and please vote for other peoples’ picks (unless you have a particular reason for not doing so).
My choice is a real underdog, since it’s not even in print in hardcover or paperback: William Manchester’s The Glory and the Dream. I’m listening to it on audiobook (thanks, Audible!) and it’s an incredible historical and cultural panorama of the US between 1932 and 1972. It’s also perfect for Kindle since it’s so massive that in print it took up two volumes. Vote now!