From the Ingram press release:
Ingram Content Group Inc. today announced that it will provide publisher content to Apple's new iBookstore.
Through CoreSource®, Ingram's solution for the storage, management, and distribution of digital content, publishers will be able to submit eBooks to iBookstore for availability on Apple's new iPad.
From the LibreDigital press release:
LibreDigital today announced it is working with Apple and book publishers to power the delivery of e-books to the new iBookstore and iPad. LibreDigital is a recommended partner for publishers looking to bring their titles to iPad and iBookstore customers.“We want readers to have the highest quality reading experience on the iPad,” said Maja Thomas, SVP, Digital and Audio Publishing, Hachette Book Group. “Working with LibreDigital helps ensure that we have the optimal quality and our entire selection of digital books on the iBookstore.”
Publishers interested in distributing their works on the iPad and in the iBookstore can visit: http://apple.libredigital.com/index.php