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I use a bunch of Apple Airport Express units and a third party piece of software called Airfoil.
Airfoil lets me send what ever audio I want to the Airports all over my house. I use it mainly for Sirius radio. The airports have an audio output port on them. You can plug them into your wired network, or plug one into ethernet and have the others chain off of it wirelessly.
If you're using iTunes for your music you don't even need Airfoil. iTunes will send your music to the Airports directly.
http://www.apple.com/airportexpress/features/airtunes.html
Thats neat, I like how you can control the Airports via iPhone
Are all your Airports hookup to a A/V Receiver? You cant hook up speakers directly to the Airport right?