I’m constantly amazed about all the fuss about only one FireWire connector on a Laptop, iBook, or PowerBook. It just speaks to the ignorance about the difference between USB 2.0 and FireWire 400/800. USB is a one to one serial connector, Firewire is a Bus connection much like SCSI only serial. Therefor you can connect up to 72 devices on a daisy chain. And in fact most FireWire devices are built Daisy chained. USB must be hubed together. FireWire 800 supports Firewire 400 devices, and can do so at the same time. USB when connecting 1.1 and 2.0 on the same port, slows down to the slowest device on the link.
So having only one FireWire port on a Laptop is NOT the same as having only one USB port.