The design of this page is sort of hard for me to get through - I know you intentionally made it informal, but maybe something to consider.. I'm a huge fan of the products you've designed, but not a fan of this layout for presenting the book. Specifically, it's way too much work to find the area to buy it, and there's no real call to action (or clarity) above the fold when the page first loads. The unicorn insults thing - feels like you stumbled into an inside joke, not an incredible ebook by an awesome designer. Just my $.02, I'm not sure if you were even looking for feedback on that but figured I'd share.
Looking forward to downloading it!