Galleycat receives tons of new book releases each week, but can only share a limited number. However, they encourage authors, publicists, and publishers to post new release information on their Facebook page built specifically for this purpose. In turn, Galleycat uses the Facebook page to create a list of major releases to share with their readers.
They ask that you include a book description, exact release date and link. For more information about this Galleycat offering, refer to this August 2011 post.