I found a couple of websites with homebrewing podcasts. You can download or listen on the website.
http://www.basicbrewing.com/ This site has both audio and video podcasts. I like the easygoing nature.
http://www.thebrewingnetwork.com/jamilshow.xml This is a bit technical sometimes...but you can find stuff you like.
http://brewcrazy.com/ This is a regular talk show that is centered around brewing. I tried it a couple times....sometimes to much banter....
So now when you go to the gym....listen to "hop to grow hops" or "making a pumpkin ale"....or not.