Funny you should ask. Just earlier today, driving home from work, I had my N900 playing an MP3 album via an FM transmitter through my car's stereo, paused every now and then by spoken directions from a navigation app (I didn't need it, I was just testing it). No big deal for an N900, but can an iPhone, an Android or a Windows do it? (Actually, if you tell me one of the three can, then my bet would be on Windows. However sad that is.)