application.rb vs. application_controller.rb: As we all know,
ApplicationControllerbreaks with Rails convention and lives in the
application_controller.rb.Be careful if you create an
application_controller.rbfile of your own, as this can confuse Rails class loading and might result in Rails deciding not to load
Google Webmaster Tools: Note that if you are using Google Webmaster Tools that statistics are different for www.example.com and example.com (sans www).