Bring out the extra USB ports on your motherboard or CPU card.
This model is especially useful, as each of the header connectors is
individual - just place the connector over the appropriate 4 pins, and you have
a rear-access USB port. Mounts easily in any unused expansion slot.
Individual USB sockets can also be mounted in any available DB-9 cut-out on
your chassis using the two screws which hold them onto the backplate - all you
need is a screwdriver.