This is very cool. I think Google Books and Amazon are both well positioned to build a Pandora for ebooks (previous discussion here:
https://www.mobileread.com/forums/showthread.php?t=55891) as they have all the texts as well as the software expertise to compute book fingerprints like this. I don't know if they will, given all the distractions they have to deal with. Perhaps a smaller company can get started with the Gutenberg catalog to build a recommendation system based on fingerprints, and then get acquired by Google or Amazon
