Found it;
http://www.velogical-engineering.com/velogical-rim-dynamo---standard-bicycle-dynamo---smooth-running-lightweight-efficient
I've been tempted by the velogical, but haven't had confirmed reports it creates enough power to charge stuff by usb. Plus i'll be building up new proper expedition wheels for this before it's next tour so dynamo is a cheaper option most likely
@laner started
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Found it;
http://www.velogical-engineering.com/velogical-rim-dynamo---standard-bicycle-dynamo---smooth-running-lightweight-efficient