"Password" to unlock
I don't know how useful this is to anyone else, but my office wanted me to have a password on the phone since I get work emails on it that sometimes contain sensitive information.
From the home screen, select Menu > Settings > Location & Security > Change unlock pattern
You can set it so that someone needs to know your specific pattern in order to unlock your phone. It's not much, but it is better than nothing. It's also very easy to setup and easy to use.
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