Podcasts catch on with news, marketing and education

Newsweek, Paris Hilton and Peterson's educational service are among the most recent converts to podcasting, audio programs that can be downloaded and played on portable media devices like an iPod.

Some 6 million U.S. adults have downloaded podcasts, according to a study released Monday by the Pew Internet & American Life Project. Research found that 29% of the owners of portable MP3 players have subscribed to the shows.