The house audio project is nearing completion. I have an AppleTV downstairs linked to the main TV and Stereo. I have another AppleTV in the main bedroom linked to the TV there. I then have an AiportExpress in the rear bedroom linked to a set of satellite speakers. Finally in the bathroom I have an AirportExpress liked to an in-ceiling audio system. With all this I can watch movies down or upstairs and use any computer on my network running iTunes or either of the AppleTVs to play through any set of speakers (the house is effectively zoned and can play the same music in every room or different in each). I can also use K's iPhone as a remote to the whole lot. Sorted!