Smartphones for Checkout Lines

QThru, another example of aisle checkout, here is described in Geekwire.   Another example of this general play, described here previously, is AisleBuyer.  Store check out line wait, often sited by shoppers as a problem,  and the required labor to service them, is a major element of retail cost.  It makes much sense to utilize the smartphone as a personal scanning device to gather this information before check out.  See also, indoor mapping, another sensor based retail smartphone application.