Guides:

http://guides.rubyonrails.org/

http://asciicasts.com/ (text versions of the railscasts mentioned below)

Screencasts:

http://rubyonrails.org/screencasts

http://railscasts.com/

Books:

http://www.pragprog.com/titles/rails3/agile-web-development-...

http://www.pragprog.com/titles/fr_arr/advanced-rails-recipes

And others in the Ruby and Ruby on Rails sections at prag progammers: http://www.pragprog.com/categories

The "pickaxe book" (http://www.pragprog.com/titles/ruby/programming-ruby) is often considered the standard Ruby reference, and there is a version for 1.9.

API:

http://railsapi.com/

http://api.rubyonrails.org/

http://www.gotapi.com/rubyrails

Conference presentations:

http://www.confreaks.com/events

Ruby and Rails projects are abundant on github, providing lots of example code.