The Clip-On USB Hub from Belkin is a portable USB hub that features (4) ports and a special clip that can be attached to the edge of your desk or a bundle of cabling, among other possibilities. The unit does not require a power supply as it receives power passively through the machine with which it is connected.
This solution's small size makes it well suited for portable applications. The small footprint also allows you to place a USB port in difficult installation areas and retain quick and easy access to files. Take advantage of this mobile unit to convert any single USB port into a 4-port USB hub wherever you wish.