Some cool USB design concepts were shown in Munich at Universal Connections. Ranging from USB-for-art's-sake to merely fanciful, the show also had items that were almost practical. The USB lock pictured, for example comes very close to being a useful device if the lock hasp wouldn't prevent a connection. The USB bra was my favorite ("Unplug and play!"). Other items, like the USB watch design have already been productized.
Universal Connections [dialog05]