I’m writing my first rails app and learning a bit of ruby at the same time. Here are some good ruby resources that I was told about.

http://www.ruby-doc.org/docs/ProgrammingRuby/
http://www.ruby-doc.org/core/
http://www.ruby-doc.org/stdlib/

http://tryruby.hobix.com/

http://poignantguide.net/ruby/chapter-1.html

http://www.ilovejackdaniels.com/ruby-on-rails/ruby-on-rails-cheat-sheet/