Arduino is evolving constantly. Not it’s got flexible form thanks to Flexible Printed Circuit (FPC) technology. It has a different view and approach comparing to well known prototypes. As it is designed on a film, so it is cut-able, chain-able with film connectors.
Despite the fact that it is quite fragile, FPC Arduino is fully functional circuit with ATmega168/328, USB interface. Probably one of the greatest uses for this is wearable electronics or other applications where flexibility and modularity is needed.