Tinkerlog just posted an in-depth study on what situration that the current-limiting resistor can be omitted when driving a led. If you want to save PCB space or just lazy like me, not going to add a current-limiting resistor between your MCU output and LED, you should defintely to have a look on his study!
Link:
http://tinkerlog.com/2009/04/05/driving-an-led-with-or-without-a-resistor/
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