Wunderlist is an all-new to do application for Windows, Mac, iOS, Android and for the web. The program manages tasks simply and efficiently, but what holds Wunderlist far above its competition is its beautiful interface. The UI on every platform is flawless in almost every respect, making task management a pleasure.
It offers seamless integration between basically every mobile and desktop platform available, with fast and efficient syncing between every device. Individual tasks can be grouped within Lists, and tasks can be starred, marked as complete, and scheduled. On iPhone and Android, popup notifications can be set to show when a task is due.
The recently released webapp lets you access your tasks from anywhere, and is so well designed it can replace the desktop applications in almost every aspect.
Check out Wunderlist for all platforms here.