I've been playing with this problem for a couple of years now. The problem is that sound streaming over IP is basically impossible to sync properly. As mentioned above, it's pretty simple to stream different streams to each room but if you want all the rooms playing the same thing, each will be off by a few parts of a second. It drove me crazy. We just ran audio over Cat5e everywhere from a central system in the living room. Home Depot's got punch down blocks that convert Cat5e into an unamplified audio output RCA jack.
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I've been playing with this problem for a couple of years now. The problem is that sound streaming over IP is basically impossible to sync properly. As mentioned above, it's pretty simple to stream different streams to each room but if you want all the rooms playing the same thing, each will be off by a few parts of a second. It drove me crazy. We just ran audio over Cat5e everywhere from a central system in the living room. Home Depot's got punch down blocks that convert Cat5e into an unamplified audio output RCA jack.