alternatively you could make one yourself . It will be much, much cheaper (under £10 ish) and will do exactly the same as others, this guy put it in a handlebar. http://howdy.wordpress.com/2010/09/27/diy-hub-dynamo-usb-charger-inside-handlebar/
@ZenithE started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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alternatively you could make one yourself . It will be much, much cheaper (under £10 ish) and will do exactly the same as others, this guy put it in a handlebar. http://howdy.wordpress.com/2010/09/27/diy-hub-dynamo-usb-charger-inside-handlebar/