At a time when concerns about digital privacy and viruses are widespread, it’s somewhat ironic that the big pop-technological trend, one endorsed by Apple earlier this week in its new version of iTunes (4.9), is a system that automatically downloads files onto people’s computers. The podcast is on the rise, helping transform the humble MP3 from a song-specific medium to a broadcast-length one. Recommended is the series from the Echoes syndicated radio program, the latest entry in which is a profile of French synthesist Francis Rimbert (MP3, dated June 28), the Jean Michel Jarre collaborator. To add Echoes to your podcast-subscriber of choice, the link is here.