The following come from this article at WeAreTeachers.com:

1. Current Events Newscasts: Practice nonfiction reading skills by having your students do weekly or monthly podcasts on an interesting current event.
2. Reading Radio: Have your students make short radio broadcasts summarizing the books they are reading.
3. Roving Reporters: Send your students out into the “field” (a.k.a. the school) to interview key players in important school events.
4. Celebrate Culture: Have your students record podcasts about important cultural months like Black History Month or Hispanic Heritage Month and then present them to the school or parents to commemorate the events.
5. Bring Your Teacher Home: Send a little bit of yourself home with your kids by podcasting important parts of your lessons.
6. Podcasting Library: Have your students collaborate to create a library of podcasts from which future students can learn.
7. MusicCasts: Have band or orchestra students create podcasts for each instrument, detailing specific notes, sounds and characteristics of each instrument.
8. Awesome Audio Tours: Give your students the chance to be tour guides for new students at your school by having them podcast school tours that kids can listen to when they enter.
9. Podcasting Pen Pals: Record interactive or encouraging podcasts and then send them to another classroom in another state or country.
10. Reenactments: Have your students reenact important events in history using period language and vocabulary.