Over at Hack a Day is a guide on how to convert your old chargers for devices you no longer use into a useful charger with a USB plug.  They will need to be of the 5V variety and provide at least 500 mA in order to be useful with today's gadgets with 1A being preferable; don't go so high you are at risk of killing your device though.  Apple fanatics will have to do the usual modifications to convince their iThing to accept a charge but most other devices won't care if the charger is home made or not, they just want the USB.  Do try not to set yourself or any of your possessions on fire by not testing your charger thoroughly before leaving it unattended.

"If you’re like us, you probably have a box (or more) of wall warts lurking in a closet or on a shelf somewhere. Depending on how long you’ve been collecting cell phones, that box is likely overflowing with 5V chargers: all with different connectors."

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