I was recently approached by PhoneCasting.com about putting my podcasts on their mobile phone focused network. It is pretty clear my intentions on my current podcasts - TechNewsRadio.com and JerseyBoysPodcast - they are both licensed Creative Commons Attribution ShareAlike v2.5. So I just sent them email that all they need to do is abide by the license, and then they could do whatever they liked.
From a quick look at the PhoneCasting.com site. It appears the RSS and the iTunes feeds are re-generated feeds that PhoneCasting.com is hosting. It also looks like they are re-hosting the MP3 files.
I could be wrong, but that is my initial assessment. I think that will in general go over very poorly in the podcast community, especially for any podcast currently in a network.
This "re-hosting" though may be part of the general industry-wide mobile phone distribution technology challenges looking to send down to the phone a more mobile network and device friendly content. In that case, podcasters are going to have to get use to this idea or decide not to participate.