The only reason I've been tempted to get one is that I'd love to stream iTunes from the computer in my bedroom to my main home theater setup in the living room. (Which begs the question of why I'd want to stream 128 kbps AAC to an expensive stereo, rather than playing the CDs I ripped the music from in my DVD/CD player, but anyway...) I don't need any of the other functions -- in fact, I'd have to install wireless capability in my computer, since I currently have a wired setup.
Are there non-Airport Express options which would integrate with iTunes, fulfill the same function, and be cheaper?