@libcroft – thanks for commenting. I agree about the fun element, and I think it’s a good point that this may be enough for some users to engage with the technology. It seems almost magical that a mysterious symbol can cause things to happen in the way that QR does. I’m a big fan of gamification too – I built some tech which was used at IWMW 2010 (http://iwmw.ukoln.ac.uk/iwmw2010/) where the delegates put themselves into teams, hunted out hidden codes and then had to answer a question to gain points. People seemed to like it – but it was a pretty geeky audience.