When fast-switching users on OS X, a running iTunes will effectively be muted because it loses access to the built-in sound devices. This makes sense, given the underlying (security) model, but is a pain when you really wanted to continue listening to the music and just switched users to, for instance, let a guest check their webmail or so.
Today I noticed, quite by accident, that when you are using wireless speakers (the Airport Express I bought just over two months ago) this does not apply, and it will continue to play quite cheerfully! Hmmmmm, I like! 
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