A really interesting article on QR codes.

I am not sure how many people ever actually use them. Certainly my HTC did not come with a bar code reader on it. One of my customers ran an ad with 20,000 copies and got 6 scans.

But if you are willing to assume that your user has  a bar code reader and is willing to use it this is a really good article about the possibilities.

Getting the Most Out of QR Codes Using URI Schemes

via Getting the Most Out of QR Codes Using URI Schemes.