I'm cheap. I rarely pay for content, but when I saw this, I didn't hesitate to pay $6. (http://www.producthunt.com/posts/the-product-hunt-manual) It got me thinking...what would else would I like to see in 50 ish page lenght, that I would pay a few bucks for? What guide would you pay for?
It's a file, it's made of content available everywhere, but it makes it convenient and may even be fun to read.