Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Mind Dump

Have you ever had the feeling that your mind is too cluttered to concentrate on a particular task? If so, this little exercise will help clear out your thoughts.

Get a pad of paper and start writing down everything that is on your mind. Include everything that you need to do, everything that is bothering you, everything that worries you, anything you regret, wishes, hopes, etc. Put it all down on the paper. Don't stop until you can't think of anything else. This has the effect of clearing out your mental closet. With a list of everything that you are thinking about, you'll be able to set priorities and make quicker decisions. This will free you up to think creatively about something that you were previously unable to tackle.
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For more mind exercises: http://www.braingle.com/mind/