The heart of the system, the very core of creative productivity. What will you do today? Solve for X, file an expense report, edit chapter 6, purchase a present for someone? If we choose to define ourselves by what we do, then today's to-dos are the heart of it. Jot down, right now, what's going to make a difference today. And when you've done it, come back and put a big "X" in the completed box on the right column.