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Apple just released a new wireless networking device called AirPort Express. Plug it into an AC outlet and it provides an audio out port for connecting to a stereo as well as an 802.11g router. Now open iTunes on a computer with wireless networking and you can redirect output to any AirPort Express connected stereo within range. Tiny. No hassles. $129. Winner.
Also, it functions as a network extender (bridge) in an existing AirPort Extreme network - just plug it in and it sets itself up.