Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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To-do Lists

Many people have a to-do list to keep track of tasks that they might otherwise forget to do. This organization [ For more on 'organization' go here: http://www.braingle.com/mind/695.html ] is a great way to help remember everything that you need to do. Having a to-do list can also help you plan your work [ For more on 'plan your work' go here: http://www.braingle.com/mind/747.html ] ahead of time. As we have learned, a little planning can greatly improve your motivation [ For more on 'motivation' go here: http://www.braingle.com/mind/746.html ] and productivity.

A pen and paper is all you really need for a task list, but many people prefer using their PDA because it can keep track of important information such as due-dates and priorities. The problem with PDAs is that they have tiny screens are often difficult to use.

A web-based task list is the best of both worlds. It's easy to use and is accessible from anywhere, even from your cellphone! Toodledo.com [ For more on 'Toodledo.com' go here: http://www.braingle.comhttp://www.toodledo.com/index.php ] is probably the most fully functional web-based task manager out there. Give it a try (it's free).
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For more mind exercises: http://www.braingle.com/mind/