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Here is a great resource for all things QR code - http://2d-code.co.uk , thanks Roger.
Here is another example of how QR codes are being used: www.MemorialTags.com , thanks to David Jones, Twitter id @memorialtags
QR codes are taking a long time to take off in Europe. 24 months ago the US and UK were on par with interest in QR codes (QRMe stats) and the last 4 months has seen the US way ahead of the UK (and Euorpe) in terms of interest. The technology has a few barriers to overcome over the next 18 months or so... Surfing plan costs, coverage, consumer awareness etc.. play a large part of this technology taking ground and gaining momentum.
I been experimenting with QR codes using http://www.beqrious.com/ I like there generator and they have a few interesting things they post on there blog.
Great tool and easy to implement
Regarding Google search, I can tell you they were looking for and decoding QR codes to locate mobile-oriented links even 2 years ago. Good insight!