I’ve been experimenting with Talking Labels.  For the NNDR poster I used a label to supply a 60 second overview (linked to below) with the intention of summarising my poster for delegates with print impairments when I wasn’t present(ing). Listen here if you like:

http://sarahlewthwaite.typepad.com/poster/nndr_label.WMA

The device was practical when I wasn’t there and, if I was already presenting, when print impaired people joined the group; delegates could then get an overview without relying on an assistant’s interpretation of the poster. Tips for use:

• Initially I put the label at the top left, thinking this would be prominent, however positioning the device low on the poster meant it could be reached by all.
• In the venue (a very large hall previously used for ship-building) the sound was not strong. As a result, I would recommend advertising it as a detachable device (use Velcro) that can be held to the ear.

The big issue is keeping the label prominent – I’m not sure I succeeded here.  However, the response from those who did use the label was very positive.