A great idea, but I do have some thoughts: does this replace a Web sight? Is it even needed if a simple-but-memorable url is included?
This idea would seem to work better in an urban setting, with a captive-but-fast-moving audience. Think passengers on Chicago's Brown Line or pedestrians on the corner of a downtown intersection.
I just hope the qtag element of outdoor doesn't fall victim to the oft-occurring small font bug that causes an eye-catching concept to require drivers to cross four lanes of traffic to identify the product/service/event name.