Get a 40% discount on the Rails 3 Tutorial book (one day only)

The Ruby on Rails 3 Tutorial book has been updated for Rails 3.0.0 final. The arduous update process was completed by changing

  $ gem install rails --pre

to

  $ gem install rails --version 3.0.0

(That's a little lie—there was a bit more to it than that—but this was the only substantive change.) Thanks to the Rails core team for all their hard work!