I’ve long been a fan of the Sonos music system, a collection of small, cigar-box-sized devices that attach to any stereo in my home and allow me to wirelessly stream digital music. I couple it with the music subscription service, Rhapsody, and get access to some 5 million songs — virtually anything I want to hear, whenever I want to hear it. As good as it is, Sonos got a little bit better today with the unveiling of a variety of upgrades and a new, free iPhone application
