Nice touch in Apple's new iPod Nano. It requires a USB connection to sync. The FireWire connector is the same shape, but if you plug one into the Nano, a message appears on the screen to the effect that FireWire won't work.

But here is the nice touch -- it still charges. I suppose the connectors are the same, so this shouldn't be surprising. But still nice to be able to charge with another person's iPod cable.