South by Southwest (SXSW) is a yearly even in Austin, TX dedicated to music, film, and interactive technology. This year, one SXSW goer gave the award for "most discussed/noticed technology" to QR codes or, more broadly, 2D barcodes of any ilk.
I'm talking 2D barcodes (i.e., QR Codes, Microsoft Tag...) that link the physical world to mobile. My client John Puterbaugh, CEO of Nellymoser and a pioneer in the development of technology that seamlessly delivers rich content to mobile devices, summed it up when he said on his PSFK panel:"2D barcodes codes are to mobile what the URL was to the Internet."
A ringing endorsement.
So, right now, you need to go to The Flack and look at all the cool shots he took of QR codes in the "wild" of SXSW. A lot of good brainstorming fodder to be had.