I am a big nerd, so whenever I see a QR code I have to scan it. Even if I am not remotely interested in what it is related it. On that note here is my rant.
Why don't people understand that you will scan them with a cell phone. Only rarely do I ever get a page actually made for a mobile device. They always direct to a page that was made for a computer. People need to know their audience. If you want them to go to a site on their phone, make it a site that is relevant on a phone. That is all.
