[nabs-l] About leaving IPod's cable attached to PC DOES IT HARM IT COMPUTER?

[Gerardo Corripio]

Hi listers: Hoping you guys with IPods can help me out With the IPod comes a 
cable to connect the IPod to the USB port on the computer, and thought I'd 
leave the USB end attached to my computer so that everytime I want to charge 
or sync my IPod I don't have to bother connecting and disconnecting, but 
want to know does it harm the PC IN SOME WAY TO LEAVE THE USB end attached? 
The PC THINKS THERE'S NOTHING CONNECTED BECAUSE THE IPod isn't connected, 
thus my question, or is it better to unplug the cable completely as before?
Gerardo