I've been having some luck with the Congressional Cemetery QR code project. I posted 60 codes there just before July 1. 25 Wikipedians had a group tour of the Cemetery during Wikimania.
Please see the news story on ABC ch 7 in Washington, July 17, 2012 at http://wj.la/M7BOUf
Some folks will notice that Ch. 7 credited me as being the founder of the Wikipedia QR Code project. My apologies to Roger Bamkin and Terence Eden.
All the best, Pete Ekman User:Smallbones