Tim Ditlow, Associate Publisher of Amazon Children’s Publishing, spoke about his months-old program at the 2012 SCBWI Summer Conference last week. While official submission guidelines are still being created, he said ACP is indeed accepting unsolicited submissions. For now, send a query email to firstname.lastname@example.org. Attach your full picture book ms or the first 3 chapters of your MG/YA fiction as pdfs or Word documents. There’s no time frame for responses yet. See ACP’s list of picture books, chapter books, and MG/YA fiction at http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000775681. Note that for now, ACP appears to function like any traditional publisher, reviewing submissions and then putting acquired books through the full production cycle, which can take a year+ for novels and 18 months for picture books. Proposals for books for adult readers can be submitted to Amazon Publishing at email@example.com.