My solution (an N900 solution only) through FM transmitter:




FM Transmitter quality it sufficient for me (little to no static due to how my car is designed I suppose) and this simply requires a single push of the button in the top right which starts the FM transmitter, activates my Next button and starts music playback. It's not an automatic solution, but as close to as possible. Also enables an impossible to miss button to skip tracks.

The true solution to this problem, I believe.. lies in the full implementation of wifi in all products (this is coming eventually) such that interaction is a simply one time set up.

As to your direct suggestion, why should the N900 have to be in close proximity? Another implementation is to have both connect to a home wireless connection and automatically synchonize. Of course the issue of this is that the N810 would need to be powered on when at home, but the remedy for this would be for the N810 to not powerdown as the car does... IF home wireless is available and then for it to shutdown on completion of synchronization.

This would also allow implementation of the device with other servers/devices on the network, removing the need for a secondary NIT device.

EDIT: One last thing: Why leave the implementation up to the car manufacturers? what's stopping a USB (or other cabled connection) from the car stereo/cigarette lighter device/completely seperate device?

EDIT2: I strongly believe the implementation now is almost entirely on the software side. We have the technologies for this... we just need prototype software to show the hardware developers that there is a need (or desire) for a dedicated wifi/storage/mediaplayer device for the car.

One final aside, is bluetooth a redeemable application? As in, is there newer bluetooth devices available with better speeds and reliability?