Craig Wealand from http://www.inglespodcast.com/ came in on my Ask the Podcast Coach Show, and shared this story. Craig teaches English to people in Spain. One half of his class he assigned listening to English podcasts as homework, and the other half didn't. In the end you will hear how the half that listened to podcasts had improved grades over those students who did not.
Find Craig's show at http://www.inglespodcast.com/
Check out www.theschoolofpodcasting.com
Check out coolwebsites.com use the coupon sop5
Here are some great episodes to start with. Or, check out episodes by topic.