7. The method of claim 4 , wherein the determining whether the current version of the user interface comprises any textual items for which there is not already a corresponding audio file comprises: retrieving a voice announcement identifier for a textual item under consideration; and consulting a database comprising a listing of voice announcement identifiers and corresponding entries indicating whether listed voice announcement identifiers are associated with audio files.
4. The method of claim 1 , further comprising: periodically retrieving a current version of the user interface and determining whether the current version of the user interface comprises any textual items for which there is not already a corresponding audio file.