I’ve placed an image slider over on the right side of the website; it’s all BSD-related books. Each image is linked to a page about the book where you can buy it. It’s not paid advertising, or perhaps advertising at all; there’s no in-kind benefit. It’s specifically books I think people would find interesting to read, and we’d all benefit by the expansion of the BSD ‘ecosystem’.
The most recent edition added is Michael W. Lucas’s FreeBSD Mastery: Storage Essentials, which is out in ebook form today, and printed form soon.