Today I went to Apple Store, Stanford, and grabbed one of those Airport Express for $129. This “plug-your-music-to-your-stereo-through-wireless” unit is pretty impressive in that way that it unleashes your music over the wireless network and it is fully integrated with iTunes, so you basically just choose which Airport to stream to (if you have more than one) and press play.
Read more about it at Apples web site, the only thing I miss is the ability to stream video to the TV, hopefully next release will address that issue (after we all have bought this one, that is)