Custom Rake Tasks: railscasts.com/episodes/66-custom-rake-tasks

Custom Validation Methods: guides.rubyonrails.org/active_record_validations_callbacks.html#custom-methods

Crontab Examples: www.thegeekstuff.com/2009/06/15-practical-crontab-examples/

Whenever: railscasts.com/episodes/164-cron-in-ruby

Heroku Scheduler: devcenter.heroku.com/articles/scheduler

Rails Initializers: guides.rubyonrails.org/configuring.html#using-initializer-files

Git Ignore: help.github.com/articles/ignoring-files

Ruby System Commands: rubyquicktips.com/post/5862861056/execute-shell-commands www.ruby-doc.org/core-1.9.3/Dir.html#method-c-chdir