Great tips on how to choose password from lifehacker
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A secure, memorable password is easy for you to remember, and hard for others to guess.
Everywhere you turn you've got to come up with a password to register for something or another. Whether it's the dozens of web sites that require you log in to use them, or your ATM card PIN, or your wireless network login, how do you decide on a new password? More importantly, how do you remember it?
Also http://en.wikipedia.org/wiki/Diceware Interesting