I know there are a lot of cyclists on this list, and thought I'd throw 
this out.  May also apply to users of other round style locks (pay 
phones, vending machines, gambling machines, etc).

Most (if not all) bike locks using a round key (such as most U Locks) 
can be opened with a Bic pen.  Remove the end cap and jam the barrel of 
the pen over the center pin of the lock - this may take some force - 
then rotate the pen barrel while jiggling the entire assembly.

Full coverage and even video can be found here:
http://www.bikeforums.net/showthread.php?t=66128&page=1&pp=25

Of course, there are professional lock picking tools for this, and it's 
not as if one couldn't do it before, but the simplicity of the method 
and availability of the equipment  makes these locks that much less secure.

YMMV.

-Adam
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