According to the Tennesean Christian podcasting know as Godcasting is a growing phenomenon:

"Although nascent, the podcasting landscape is growing with an audience expected to reach 60 million people nationwide by 2010, according to The Diffusion Group, a consumer technology research firm based in Plano, Texas. And religious content is one of its fastest-growing segments, say observers. Lycos.com reported last year religious that programs and sermons are the most popular genre"

Yet another area of communications (what I call marketing) that is growing beyond the average church's capacity to grasp. All the more reason to have a minister of communciation at your church. Wether they are paid or volunteer, this will be a big job and don't underestimate the importance.