It features forewords by David Heinemeier Hansson and Yehuda Katz, and I noted that the larger sections include:
I'm really looking into reading this tome.
I'm reading the routing section now, and so far its very clear. I'm pleased that routing feels a little bit like Sinatra to me! This is especially nice because the main reason I used Sinatra was because of how simple and light it was, and since then its grown a lot more heavy - all the while Rails 3 got a lot more modular.