Comment Apple Airport Express (Score 0) 438
honestly, that's probably the simplest solution. add an airport express for each room you want and you have an instant wireless music network. add an iPod touch or an iPhone and you have a really excellent remote that lets you easily switch the music from one room to the next and multiples at the same time with no delay, as well as creating custom playlists on the fly and using itunes DJ and genius playlists. plus it can join your home wifi network and share printers, charge USB devices, or even extend your wifi network. to me, this is probably the most under-hyped apple product ever. it's made my life so much easier. i only have one, but i can just unplug it and move it to another room and have it hooked up somewhere else in seconds, and the remote app on the iPhone is worlds better than any other audio remote i've used.