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The Five Training Rules as posted by Caleb Masland at DailyMile are:

1. Missed Workouts are gone. NO MAKE-UPS.
2. If you are debating whether or not you need a rest day, then you need a rest day ((Substitute "ice cream" for "rest day" if you please.)).

Train at your current level, not your ideal level ((I suspect that, truthfully, you should train at just a teeny weeny bit better than your current level.)).

3. Aerobic Fitness > Numbers from a Track Workout.
4. One Thing at a Time.