NPR’s Robert Smith reports on the rise of “podcasts” — amateur music and talk shows created by the users of Apple’s popular iPod personal music devices and other digital music players. Whole “shows” of music and talk can be downloaded from the Internet to individual players automatically, and some of the show hosts have become celebrities among the burgeoning podcast audience. Related stories from NPR:Personal Radio Via Podcasting Grows More Popular; Slate’s Gizmos: The Future of Radio; Does the iPod Play Favorites?; TiVo, iPod, the Human Ego and the Future.