If you go the www.zune.net, you’ll see that the Zune Marketplace will be offering exclusive video podcasts for the Heroes TV Show upcoming season. Apparently, these video podcasts will be more like music videos, so they should be entertaining. And so far as I know, they will be free! March 18th is stated to be the release date, so keep an eye out for them.
As of now, you can download the first available video podcast by going to the http://www.zune.net main site.