I use toodledo.com for my non-urgent to do lists. It has an iphone app and android. I find paper better for to do this day combined with my pomodoro sheet. http://www.pomodorotechnique.com/
Summary: The Toodledo online task management system is popular, and toodleTasks HD for the HP TouchPad works seamlessly with the service. It may be the best task manager on any platform.