Xbee Explorer USB versus Xbee Explorer Dongle

Does anyone know the difference between the Xbee Explorer USB http://www.sparkfun.com/products/8687 and the Xbee Explorer Dongle http://www.sparkfun.com/products/9819 ? I understand that one requires a cable to connect to the computer and the other does not, but is there any other real difference?

but is there any other real difference?

No.

Thanks.