I like visual reminders that serve as cues to trigger thoughts of gratitude. Some people, such as my wife and I, attach Post-It notes listing blessings to their refrigerators, mirrors, steering wheels, or other noticeable locations. Others set their pagers, beepers, or Personal Digital Assistances (PDAs) to signal them at random times throughout the day. When they are signaled, they pause and count their blessings on the spot.

Robert A. Emmons, Thanks! How the New Science of Gratitude Can Make You Happier