How can I use pubsubhubbub to support a podcast?

How can I use pubsubhubbub to support a podcast?

Okay, I get the general idea of the distributed RSS model that pubsubhubbub uses, but I'm trying to think of a way to "support" a podcast with it. That is, I want to supplement the bandwidth of a podcast I like, but which needs more bandwidth, or is hampered by the cost of publishing. I'm thinking like some kind of guerilla CDN.