With the proliferation of smartphones more and more organizations are starting to use QR codes. They are a great way for smartphone users to quickly get more information on a person, product or service. I have seen them used on anything from business cards to billboards. But as always you need to beware what you click on. Criminals have also found ways to take advantage of this. About.com has a great article about How to Protect Yourself from Malicious QR Codes.