I recently began listening to a new podcast titled "Whence Came You" produced by Brother Robert Johnson of Illinois. Brother Johnson already has produced 25 podcasts which have covered a variety of Masonic topics including the York Rite, Scottish Rite and many others. The podcasts run about 15-20 minutes each and are available at either the website on in itunes for apple users.
I enjoy listening to them and Brother Johnson has done a great job with these. I encourage you to check out his website and listen in!