OK, so this isn't break-through technology. But it does show the increasing availability of convenient alternative energy for charging gadgets.
Oscar L'Hermitte has designed a cool cell phone charger that clips onto the reflector of your bike.
The charger just clips on, and you ride for (yes, this seems like a long time) 90 minutes for a fully charged cell phone battery. But if you only need to top off your battery, then the ride can be much shorter.