giving podcasting a try

I'm in the works of planning my podcasting lesson plan, which I actually have a plan to implement next week. My school is actually participating in a podcasting pilot program, and I was more than excited to volunteer to participate! My plan is to have my students create anti-drug advocacy podcasts. I'm thinking that they can be anywhere from 30 seconds to 2 minutes, depending on the type of message they want to send. I just have one question. How do I allow students to work and record their podcasts with 40 students in one classroom without too much noise? Hmmm......