The AirPort Express Base Station with 802.11n and AirTunes from Apple is a compact wireless base station. The device can act as an Internet router for up to 10 users, or can be used to extend the range of an existing wireless network.
The AirPort Express also supports wireless printing for USB printers. It also has a hybrid analog/digital audio jack, allowing you to connect it to a stereo system or surround sound receiver. You'll be able to use it to stream music wirelessly to the stereo from any computer in your network that has iTunes installed.