From Publishers Lunch:

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Simon & Schuster will make 5,000 more titles available for Kindle within the year, more than doubling the total collection from the publisher (currently at around 4,000 titles) to comprise "the vast majority of sales" from their catalog. Jeff Bezos calls it a "huge effort and great committment." Reidy says in the press release, "We are excited by how many Kindle books we're selling and the feedback from readers who want to read our titles on their Kindles. We have also learned that readers aren't just looking for new or bestselling books, but also books that are older or hard to find. These are the books that have proven themselves to be of enduring interest, and we want readers to be able to find them anytime, anywhere."
Amazon adds this small factoid in the release: "After purchasing a Kindle, customers purchase, on average, just as many physical books, and their total book purchases on Amazon increase by 2.6 times."
Thomas Nelson has signed with Ingram Digital to host, manage and distribute their digital content, including implementation of Ingram's Search and Discover program.