I found a new podcast listing site last week and got Missionary Talks listed there. It is called Clean Casts. All the podcasts listed on the site are either G or PG rated. It is not a huge listing of podcasts yet, but it is nice to know that you can choose something there that will be family friendly.
There are a few podcasts that I listen to listed there, but there are several other good podcasts that should be there. I should compile a list and contact my podcasting friends to get their shows listed there and help grow the community. The site is fairly new and needs help getting some momentum pushing them the right way.