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The 10 ways to destroy arduino page that I think you're thinking about is advertising for a ruggedized arduino, so naturally they're exaggerating the possibility of damaging the unprotected arduino.
Never mind the fact that at least half of those 10 ways won't damage the chip...
gilperon:
connection an output pin to the ground pin with no resistor will damage my Arduino?
Only if you also set the output HIGH.
An input pin is a relatively high impedance - connecting an output pin to it will result in very little current flowing.
Connecting an output pin to ground is a very low impedance, and setting the pin to HIGH will damage the output driver.