title: Schedule a method to run once a day in Rails 3
body: <p>I have a method that checks to see if a user has submitted a timesheet for the previous month and if they haven't, sends out an email reminder.  This method needs to run everyday. There is no action made by any user to actually trigger this method, it simply runs at a set time everyday.</p>
  
  <p>Any idea on the best way to implement this in Rails 3?</p>