To reiterate what Fran already said, this idea of a notice board is a good idea but seems to already be covered in a slightly differently organized way with the review system. In this way, we do not have to worry about authors spamming us with self-promotion, but we give them an even better chance of getting even better publicity for their book by having an honest review published by a third-party whose endorsement surely means more than the author's own endorsement of his own book. As the reviews start coming in, I will create an organized list of all the reviews of these independent books. All the authors who get reviewed in this way are members of the forum, even if they have not made a post.
Authors can submit a review request for their book at: Review Request
Non-Authors can request access to the free books available for review at the Usergroups Tab of the User Control Panel