I just finished worked through the newest version of the Ruby on Rails Tutorial and feel like I have a much better handle on Rails 3.2. I do recommend it to get people up-and-running on some of the latest things in Rails.
However, I think that my favorite part of Rails 3 is one of the most hated: Bundler. It really just made things so much easier for me.
But I’m crazy, so don’t worry.