Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Get Organized

One of the best ways to improve your memory for every day facts and avoid absentmindedness [ For more on 'absentmindedness' go here: http://www.braingle.com/mind/277.html ] is to get organized. Disorganized people report more memory problems than people who can easily structure the information that comes to them.

Having a good organizational system in place will ensure that information will not be misplaced, because if you have a specific place for everything, the mind knows exactly where to go to retrieve that information. For example, a disorganized person might throw their keys anywhere in the house. This means that they must remember at all times where their keys are, otherwise the keys become lost. If you are organized and always place your keys on the hook next to the door, then your brain doesn't need to remember where they are because they are always in the same place.

For less tangible information such as phone numbers and dates, you could use a PDA or notebook to keep track of the information. This frees up some mental energy for more creative or productive uses. Once this stuff is written down, you no longer have to expend energy keeping it in your brain.
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For more mind exercises: http://www.braingle.com/mind/