I'm liking this. I've just tried the n900 with my car kit which only opens an audio channel until a call is in progress. Now, bringing the n900 into the car effectively mutes the n900

As it is clear that the n900 can route different audio to different speakers and change that routing on the fly (I'm guessing via pulseaudio), doing this isn't beyond possibility. I like the thought of intelligently changing routing depending on individual device also.

If you have multiple bluetooth enabled stereos then a walkthrough ofthe house would be an awesome demo.