Daryl Furuyama at WhiteHatBlackBox has created a fun way to keep track of your to-do lists by making a game of it. Each task is represented by a Space Invaders icon which you can gleefully shoot down and take as a trophy once you've accomplish them. These trophy are then taken off the current to-do list which helps to remove the clutter. I can imagine that this would be a great tool to teach kids on how to become organized. Rather than doling out stickers or keeping track of stars, tasks around the house could be given in the form of a different invader that needs to be captured. What the prize is at the end is completely up to you!
This program is free for downloading at WhiteHatBlackBox.