I received my Airport Express this morning. I bought it primarily to connect to my living room stereo. I'm using a Netgear 802.11b router, a PowerBook G4 and a G4 iMac. It took longer to install the new Airport 4.0 software than to do anything else. I added the MAC address of the Airport Ex to my allowed devices on the Netgear router and then ran the setup assistant. It asks if you wish to create a new or join an existing network. I picked join existing and then selected my network in a menu and entered my WEP key. That's it! It works as advertized and allows you to listen to shared playlists over Airtunes. I share my music library on my iMac and then use the PowerBook to control everything. It kind of makes the PowerBook one big, expensive remote. I have another one on order for the bedroom.