Bardaudio offers a line of wireless digital audio distribution systems in the here and now, for existing homes and for homeowners seeking to avoid the pitfalls of building permits, contractors, and "early adopter" technology. The $599 BardUSB is designed for those who enjoy their computer as a media hub to playback CDs, iTunes, podcasts, or even Web-based XM satellite. It's a plugand-play transmitter no bigger than a typical microdrive or memory stick.