On the one hand, we hate concept videos only because they seem to promise more than they can deliver--it's like a big tease. On the other hand, it's nice to think big and push the boundaries a bit as it stirs innovation, design and hopefully real applications.
The above video, which is extremely well produced, was a project by Luca Trinchero (who sent this in to us) and Gianvito Toscano at the Polytechnic of Milan in 2010 and it's of a concept app called 24 Seven (catchy!). It looks like a combo of Groupon and ShopSavvy, presenting deals to you on the go, the ability to scan barcodes for price comparison and evidently a way for your roommate or partner to update your grocery list remotely (that last part is pretty darn brilliant).
Finally, the app appears to total your groceries (because you were scanning each one) and you pay using the phone. We're already seeing something like that at Stop & Shop here in the States, where they let you scan, bag and pay for your items all on your own--so very feasible. The would-be developers do tell us "..maybe we will develop it, stay tuned!"
We will guys, keep us posted.