Japan has given us great insight into what mobile applications will be accepted.
From What Japan Thinks a survey was done asking what people use and want on their mobile phone
From the total of 300 people, 234 of them, or 78%, used their camera once a month or more.
Q1: Please tell me all the things you use your mobile phone camera for. (Sample size=234, multiple answer)
Still camera 233 99.6%
Bar code or QR code reader 131 56.0%
Moving picture camera 113 48.3%
OCR 21 9.0%
Other 1 0.4%
A bar code reader used more than video.
American Idol did a great job of introducing text messaging to the masses, maybe Kelly Clarkson could put 2d codes on her marketing material.