Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Lifetick - Lifetick is an online Goal Setting application with a stylish, easy to use interface.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Beeminder - Beeminder
Things - Things is an easy to use task manager.
Joes Goals - Joe's Goals is an online goal-tracking website. 100% Free. No Download Required.