Have you ignored QR codes, those funny looking squares we've seen pop up increasingly over the past year in print ads, billboards, and on the product packaging? I've not found them very enticing personally, and have been unable to find good uses for them by advisors. Turns out, that's good. QR codes are now regarded as security threats.
"the nasties are using QR codes to lure people into downloading Android malware," says TechCrunch. "While some users are likely to assume that QR codes are unique to the Android market and thus be comfortable scanning them, these codes actually take you to an Android install package hosted on some third-party server. The QR code itself isn’t bad — but the link it’s obfuscating is."