How many people who have Bluetooth use it for anything other than a wireless ear piece?

Are there any applications that make use of it?

I was sitting in a coffee house in a shopping centre on the weekend and was thinking about the potential for Bluetooth.

I didn't know where a certain shop was so I thought a focussed map of the area would be useful.
The shops could put out adverts saying the offers they had on that day.
Bluetooth has a limited distance so repeaters would probably be needed.

I'm sure this idea could be extended to further/similar uses.
It would probably be very popular since, being bluetooth, it would be free.

The shops could pay for it out of the advertising revenue.

What do you think?