I just read an article that showed a group that – once again – can't get any love from the main stream media (although Chaz Bono on Dancing with the Stars is pretty main stream in my book). 

The Rainbow Radio Philippines podcast startedas a radio show. The programme arose out of the need to educate the public,” said Maica Lagman, a volunteer who served as the host. When we produced the show, we always made it a point to represent the LGBTs… because in commercial or mainstream media, they aren’t really given space.”

In helping people podcast, I've helped Christians, Atheists, New Age, Law of Attraction, Yoga, and many other niche topics. If you can't get your message or voice on mainstream radio, take the time you spend banging on their door and go through the open door pof pdocasting.