The iPad gets all of the attention but there really area other tablets in production and there are Apps (application) that are being designed to make shelf reading easier.
This is a prototype of an application designed for the Android system that was presented at the ACRL 2011 Conference in Philadelphia, PA. This application used with a computer tablet or smartphone would make circulation a lot easier.
This is just a prototype. There are issues about spine width, the types of classification system use or perhaps even thinking about using QR codes that could embed the DDC/LC systems instead.
If this is transferred into libraries it might mean there is one less library support person necessary. On the other hand the gizmo can't walk itself and there will be some materials that will not lend themselves to use by the App.