My brother (the one who bought the unit) and I (the one who queued for it for half a year) were discussing this.

The thing we agreed upon was that it'd be useful to keep a count of the songs you started playing, and the songs you finished playing (i.e. didn't get fed up with half way through and skip). I also think it would be cool to have a 'rating' system that you could record how much you liked that song. These could then be downloaded as a CSV file or something to play around with.

The point of this is to allow you to get real feedback on what songs you are playing and how much you like them in the field. I know I have a whole slew of songs that I don't mind, and wouldn't immediately delete, but might be filling up my empeg and preventing me from uploading songs which I liked more but were more recently acquired. What you'd listen to in your own loungeroom or at your computer is one thing, what you listen to while driving is another.

But then I live for statistics.

Save the whales. Feed the hungry. Free the mallocs.
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Owner of Mark I empeg 00061, now better than ever - (Thanks, Rod!) - and Karma 3930000004550