Allow for recording voice memo on the road. This makes for a great trip log of things we forget otherwise becaue we cannot write it down immediately.
I presume there is some space quota assignable (like 100MB) on the embeded flashcard (that can be shrunk as the firmware gets bigger),
The audio would be very compact at 11kHz mono, and could be mp3/ogg/wav/au format.
Ideally, being able to replay and delete is required. All that is necessary is to name entries by number "memo 1..n".
On the PC, with the device manager, it's all simple: a list of memos to export/delete.