In aisle scanning continues, competing with automated checkouts. The claim is that 40% of people now use some form of automated checkouts. Here is another update from Stop & Shop where they continue to test hand scanners. I participated in some of the innovation center design analysis of this system when it was developed by Symbol. We asked many consumers about their reaction to the service and many liked it, though they had concerns about dealing with another 'system they had to learn. Motorola acquired Symbol and Modiv Media now makes the software.
The article makes the point that the idea may attract customers through convenience, but it is ultimately a labor eliminating play for the retailer.
It seems that there is less activity with shopping cart attached displays, which in some cases also include scanners. Another concept we tested. Most notable is Mediacart which saw much press in 08 in conjunction with a partnering with Microsoft. In January 08 I saw that they were linking with a small chain called Wakefern for a test. A quick search shows nothing new about them since last January.
A more passive related idea that does not scan, is the cart-handle based Modcart from Modstream.
Update: More on this, includes a photo of the engagement display for the scanners.