Everyone carries a keychain around, so why not make yours do more than hold your phone number just in case you get lost? The Key Chain Solar Charger is pretty self-explanatory - it provides additional juice wherever you go, as long as there is adequate sunlight in the vicinity. Meant to be an emergency power backup, it works best with any USB-charging device. Retailing for $22 a pop, you can also charge it from a power socket just before you head out on your travels.

Source: Red Ferret