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KeyCardDo you work with your Mac in a public or insecure location (like the school library)?  If you use an iPhone, you can now force it to go to sleep when you walk away using a new Bluetooth App called Keycard.  9to5Mac just reviewed the product and gave it a passing score – with points off for the relatively high price (over 5 USD).  Essentially, you pair your phone with your Mac and when the pairing is lost, your Mac goes to sleep.
If you don’t use an iPhone, Salling Clicker might do the same thing for you it they supports over 300 different mobile phones – but not the iPhone.  Also, Clicker brings a host of other functions to the table as well.