Best online (free) resources for learning Ruby on Rails?

Question

It seems like there's a lot of cool stuff going on in the Ruby on Rails world. I am primarily a PHP developer, and use Zend Framework for creating web applications, but I would like to learn more about Ruby on Rails.

Where can I find the best online resources for learning Ruby on Rails?

Resources:

Here are some of the resources I've collected so far:

• http://guides.rubyonrails.org - Excellent "getting started" guides discussing various aspects of the Rails framework.
• http://api.rubyonrails.org - When you need to look up a function/class and learn more about how it works, this is a great place to do it.
• http://www.railscasts.com - various high quality video tutorials. Helpful for learning new things you didn't know that you wanted to learn.

Answer 1

I think http://guides.rubyonrails.org/ is a good place to start. You an also read rails in nutshell book for free while it's being written. Railscasts is also very good resource if you want to learn cool rails tricks.