These are some of the podcasts that my students have enjoyed this term. I put one up each week on Blackboard and encouraged them to listen for homework. You need to do a bit of searching to find what suits you and your students.
Karen's podcast souNZ English
BBC learning english podcasts
Talk about English: Better Speaking
6 minute English
Breaking News English
Radio NZ podcasts
It would be good to add a comment or two here on which ones you find useful.