This is actually pretty cool. When I clicked, I was expecting some sort of hardware card. When the page loaded and I saw the QR code I was about to hit the back button... but realizing that I could track how the QR code on a business card performs was an eye-opener. Super obvious, but somehow I had never thought of it before.

Of course, this functionality is absolutely trivial for any web startup to set up, but I imagine traditional small businesses would find this page super useful. In fact, I'm going to recommend it to a few that I know, because I'm curious what their reaction will be. (I suspect that I will have to explain what a QR code is first, though.)

EDIT: Did not realize that this site was built by the submitter. arroyo, really slick design. Nice simple idea. Like I said, maybe too simple for tech folks but I suspect you will find a lot of non-tech interest here if you're able to clearly convey how a QR code helps them. The business owners I have in mind would need more convincing than what you have on your site, and you'd be fighting the back button the whole time.