Quite honestly to, i'd be proactive in finding guests and hosts rather then asking if there are any volunteers in such an endeavor.
Asking for volunteers for such a thing often doesn't get the best results. It's like asking for volunteers for Mods.
It's going to attract some people... some suited... most not. While it should be fairly obvious what people have interesting things to say on the forums, often i've found some of the most competent people are the least likely to volunteer for tasks but will "serve when called opon."
To get a Podcast off the ground you gotta make sure your first few are really good. So you need to make sure you don't hit any "bumps" early or you're in trouble.
You'd make a great host though.