QR codes are 2D bar codes which are increasingly used to encode URLs and so function as an interface connecting physical places with virtual ones: just point your (supported) camera mobile at a code, snap, open the link in your phone's web browser. Et voila!
Semapedia allows you to annotate places by allowing you to create your own QR codes pointing to Wikipedia articles. Think physically present, distributed micro travel guides... Check the flickr group for other real world uses...
Adoption of QR codes is especially high in Japan, where it's mainly been used for advertising. Jan Chipchase, Principal Researcher in the Mobile HCI Group at Nokia Research, has snapped some great mosaics purely made up of hundreds of individual bar codes.
[from Karsten Schmidt @ everyoneforever.com]
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