QR Code Malware
You might have seen QR Codes affixed to advertisements in magazines or in public spaces.
They look a little something like this:
For the last several years they have been used to quickly transfer URL information, phone numbers and other types of information to people that use smartphones or PDA devices with cameras. It turns out now that with the success of this format, people have figured ways to subvert the system to send people to malware sites and other unsavory locations. Dark Reading as a great article on how the system works and what it being done to use it for evil purposes.