Tres Cosas makes it fun to do focus on three simple things each day to move your life forward. Use it to make progress on your health, relationships and career.
I've been using Tres Cosas for a week now, and have really been enjoying it. In particular, I like it because it 1) helps me focus on today and tomorrow, not the far future or past; 2) is keeping me well-rounded, not thinking of productivity as a work-only thing; and 3) is designed with such simplicity that I'm not carrying around the plaque of todos/reminders that build up over time. I highly recommend checking it out.