Unglue.it: books for the people

I saw this on the O'Reilly Radar blog, and absolutely love it:

"We all have books we love so much, we'd like to give them to the world. We want to share them, but also reward their creators. With digital books, it can be hard to do both. Unglue.it offers a win-win solution: Crowdfunding. We run pledge campaigns for books; you chip in. When, together, we've reached the goal, we'll reward the book's creators and issue an unglued ebook. Creative Commons licensing means everyone, everywhere can read and share the unglued book - freely and legally. You've given your favorite book to the world."

If you could gift one book to the world, what would it be? Head over to https://unglue.it/ to see what others have come up with.