Aireo, a <A HREF="http://www.twincities.com/mld/twincities/business/technology/personal_tec">portable digital music player</A> from Minnesota-based SoniqCast allows users to transfer digital music from their PC to the unit wirelessly by means of built-in wireless networking capabilities. The device is due to hit shelves at Best Buy in the next month and will retail for about $300.