Always kiss each other good night AND good morning. Even if it's over the phone due to one or the other being not being able to be there in person.
I have these 2 signs hanging in our bedroom as reminders, although I don't believe we need the nudge!
All too often we get so busy in our daily routines and demands that it is too easy to forget the most important things that we really need to reinforce...our love for each other.