During my life of going to church, there would be a sermon every so-often where you wish that you had an audio copy. Usually, volunteers would have to make a cassette tape and you would have to wait a while for those to be made.
That's changed with podcasting. Confessions of an Undercover Geek has a link to a New York Times story about how pastors are leveraging this new technology to get the Word out. There's also mentioned stories of how users are reacting to it.