My sis has an eMac and an iPod shuffle. The shuffle can't charge in the eMac since it doesn't fit into the USB port and there's not enough power for it to charge from the keyboard. She doesn't particularly want to have to fork out the £15 for an iPod Shuffle dock and various sites suggest adding a USB extension. She's found an extension cable (2m) and will ask in the store if they have a shorter one. Is the level of charge provided by the USB port affected by the length of cable? Should that work - or will she need to fork out for a powered USB hub or a Dock?