TaskMate helps you stay organized and doesn't get in the way. The compact window can be placed in the corner of your screen so that you are always aware of what is happening.
With iTunes-esque inline editing, tasks can be easily managed. A simple click marks them as complete. There are no complicated features or unnecessary options that can slow you down, unlike many task tracking apps. It's the to-do checklist made easy again.
The software is free but it is donationware. To support development, please consider donating.