To start, Amazon.com, Inc. (NASDAQ:AMZN) says there will be more than 10,000 e-books available when Kindle MatchBook officially launches in October, including books from Ray Bradbury, Michael Crichton, Blake Crouch, James Rollins, Jodi Picoult, Neil Gaiman, Marcus Sakey, Wally Lamb, Jo Nesbo, Neal Stephenson, and J.A. Jance.What's more, Kindle MatchBook will include all print titles already published through Kindle Direct Publishing, and Amazon.com, Inc. (NASDAQ:AMZN) promises there will be plenty of additional books available down the road. Here's why this is a win-win As Amazon.com, Inc. (NASDAQ:AMZN)'s press release also points out, customers have long requested the bundling of paper and electronic texts. After all, many readers simply aren't ready to give up their beloved physical copies of their favorite books, but you must admit it's typically more convenient to bring along a digital copy on your Kindle for traveling purposes. Then again, this also raises the question of whether Kindle MatchBook might potentially cannibalize duplicate sales that publishers and authors might have otherwise enjoyed. However, Amazon.com, Inc. (NASDAQ:AMZN) already headed that objection off with a quote from best-selling author Marcus Sakey, who said, "It's ridiculous to ask readers to pay full retail twice for the same book." Besides, this program may also be able to spur many complacent consumers into buying additional electronic copies of books, pulling in new purchases they otherwise wouldn't have considered. What's in it for them? Of course, while this fulfills an oft-requested consumer want and provides a potentially significant additional revenue stream for existing publishers and authors, the folks at Amazon.com, Inc. (NASDAQ:AMZN) aren't doing this entirely out of the good of their hearts, either. Remember, a few weeks ago, competing bookseller Barnes & Noble, Inc. (NYSE:BKS) said its traditional retail business revenue not only fell 9.9%, but its digital content sales also fell a dismal 15.8% year-over-year in Q2. Meanwhile, Amazon.com, Inc. (NASDAQ:AMZN) last quarter boasted total sales growth of 22%, a performance largely driven by digital products, which represented the 10 top selling items across all of Amazon.com during the quarter. Kindle MatchBook, then, should effectively serve to run up the score and accelerate the migration away from Barnes & Noble, Inc. (NYSE:BKS)'s digital and core bricks-and-mortar operations, and toward Amazon's already-impressive digital segment.