{mosgoogle}Media Center PCs can record TV programs off the air into their huge hard drives, and store all your digital music, too. They connect directly to TV and stereo, but also have Wi-Fi networking to send digital entertainment to other rooms in the house.

Consumer electronics vendors are getting into networked digital music, too. Onkyo has a new line of Net-Tune Network Receivers. They're conventional stereo and A/V receivers that can connect to a network using Ethernet cable or, with the addition of Wi-Fi bridge, wirelessly. The Net-Tune products play music stored on computers in the network, plus internet radio stations.

The ubiquitous iPod, meanwhile, can play a role as well. Several manufacturers have developed speaker systems that doubles as iPod charging docks - the sleek-looking and big sound Bose SoundDock, for example. Slip the iPod into the dock, push play and music fills the room. Of course, you also plug an iPod, or any portable digital music player, into your stereo system.

The changes all these technologies have wrought are profound, but don't think for a minute we've seen the last of them. The digital music revolution continues. Stay tune.