This is a great contribution to the hacker community. I've been using git for about 1 1/2 years, but I can't wait to read this book and learn more.

If you go to the github URL, this is also a great way to see how one can use a markup language like Markdown to write an entire book in the text editor of your choice, e.g. Vim.

Someone from reddit converted the book to PDF and made it available here:

redraftable.com/temp/progit.pdf