Palo Alto Research Center has a blog post detailing research into making mobile printing easier with QR codes:
Currently, about 20 U.S. airports enable passengers to check in through a “mobile boarding pass”. These airports use special scanners to read the 2D barcodes displayed by diverse mobile manufacturers’ hardware.
We realized a similar technique could be used to “acquaint” a mobile phone and a printer, so that someone could easily print something from their phone wherever they are and whenever it’s needed (e.g., instructions, maps, notes, product information to leave behind for a prospective client).
To print from your phone, you first have to make the phone and printer “talk” to each other — which isn’t always easy. I don’t know how many times I’ve had to re-register my Bluetooth- or wifi-enabled mouse with my laptop; the irony is that they’re sitting right next to each other!
Interesting use of QR barcode technology outside of the many marketing applications we see.