At the top of the page I have a few tabs with links to the main index page, ‘Home’, my main Podcast feed ‘mp3 podcast rss’, and now a Podcast feed with just PSAs. (PSA: Public Service Announcement) So if you feel like listening to PSAs by themselves have at it. Also if you’re a Podcaster download the PSAs and use them in your own shows! Ain’t distributed sharing for good causes fun! 
Here’s the link. http://www.audioactivism.org/category/psa_mp3/feed/rss2
This is a great idea. I’ll listen and try to include some in my podcast. Have you seen Tom Wiles (Trucker Tom) podcastpromos.com? It’s a place where you can post your own podcast promo and pull down ones from others. I’m sure Tom would consider an additional track for PSA’s too. Ask him.
Charlie