Actually a pretty neat idea, although the physical execution could be improved along the lines mentioned above. Would also make it compatible with standard faceplates.
They should also rig some kind of mechanical switch that only powers up the 5V power supply circuitry when a USB plug is actually inserted into one of the DC ports. Otherwise, it is a bad a power waster as any other "wallwart" type adapter.
These would be nice in hotel rooms. Recharge phones, GPS, handheld games, etc.