I'm getting started with Ruby on Rails. I think some cheat sheets or reference cards would really help me to get started (specifically, with migrations). Do you know of any cheat sheets or reference cards that would help me get started?

Too obvious? http://appletree.or.kr/quick_reference_cards/Ruby-Ruby_on_Rails/rails-migrations.pdf <strike>http://dizzy.co.uk/ruby_on_rails/cheatsheets/rails-migrations</strike> (no longer available) <strike>Same cheatsheet available here: http://appletree.or.kr/quick_reference_cards/ruby-ruby%20on%20rails/rails-migrations.pdf</strike>