This post was published more than a few years ago (on 2004-08-25) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
I'm curious... if my wireless network is bridged to my "wired" ethernet computers through my wireless router, why can't my wire-bound Macs play to the AirPort Express in the living room as well? Sure, I can "share" my iTunes music to another Mac that does have an AirPort card in it, and play from there--- but doesn't that seem a little... inefficient?