The commercial shows our "Tesco family" using the barcode scanning facility on their iPhone as they go about life. You'll see the ad popping up all over the place on commercial TV channels in the UK over the next four weeks.
If you haven't spotted the commercial yet, don't worry: I watched Emmerdale on your behalf and recorded the commercial (the things I do for you!). You can watch it now:
Don't forget that you can use the barcode scanner on the Tesco Groceries app only if you have an iPhone 4 or have upgraded your iPhone 3GS to IOS4 (which you can do easily using iTunes).
The groceries app will work on iPad and non-IOS4 iPhones but the barcode scanner is disabled for technical reasons and because the iPad has no camera!