It appears that either an accidentally released update to iTunes that was pulled or an update to the Airport Express Base Station which is not widely known has brought in a new feature.

Some readers on World of Apple have notified us to a new feature which seems to enable the selection of multiple speakers within iTunes.
Also ratifying this the Airport Express page has been recently updated to say:
AirTunes: Your Music Unwired
AirPort Express with AirTunes extends your wireless world even beyond access to the Internet and your home network. It brings your iTunes music to virtually any room in your house, or several rooms at once, if you like.


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The following comments have been added by readers:
Kasper
14th January 2006, 12.23 pm
They are really not kidding about the “..several rooms at once”. I tried it out on my PowerBook with the built-in speakers and the AirPort. They were also in sync. If only AirFoil from Rouge Amoeba or the Apple DVD-player had the same sense of sync’ing sound and video.
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Marty
14th January 2006, 23.11 pm
As soon as I installed Airport Express Firmware update 6.3 the multiple speaker option was available.
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