Podcasting in the classroom

This is pretty new to me...not podcasting itself (our church does this), but creating one. I think this would be a really good tool if you were going to be out of school due to sickness, field trip, workshop, or any other reason. I set up my podomatic account and i am going to try and make a podcast. at this point, im not sure what to do or how to do it, but it looks pretty cool!