This blog is usually about using writing to communicate with others. But writing has another use: communicating with ourselves.
You can use paper or your screensaver or another program to give yourself reminders. Often we get caught up in our everyday business and lose track of what is most important. To keep yourself on track--instead of just keeping yourself busy with low-priority tasks--simply write down a reminder that can stop your thoughts when you see it and guide you back on track again. I like the reminder: is this useful? Then put that reminder where you can't avoid seeing throughout your day.
(Thanks to Lifehacker for the link.)