I remember awhile back when I had an original Palm Pilot, there was a problem called 'cradle drain'. It was caused by the palm emptying its batteries thru the serial cable on the dock/cradle, and burning your batteries out extra-fast. I was wondering if the newer iPods suffer the same type of drain? Will my ipod's battery drain if I leave it in the dock while my computer is off, say, overnight, or does it 'know' that power shouldn't be wasted that way, and is ok to leave plugged in?