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.

via toodleTasks HD for HP TouchPad: Best task manager review | ZDNet.