Today, Nintendo released a Shigeru Miyamoto pet project for Japan's DSiWare service: "Make Your Own DS Guide," an app that allows users to record image and audio samples, and then push them out to nearby DS systems via Download Play. The idea is that people and businesses can create self-narrated guides for any event or location (like menus for a restaurant or information about an art exhibit).
In fact, this idea is based on Nintendo's experiments with using the DS to provide maps and audio tours
in museums. You can see the free app in action at Nintendo's DSiWare site