Here is a great list of Podcasting sites…
podcasting-tools.com/submit-podcasts.htm
www.podcastingnews.com/topics/Podcast_Directory.html
blogtalkradio.com/
apple.com/itunes/podcasts/
allpodcasts.com
feedooyoo.com
plazoo.com
podcastblaster.com
podcastlikethat.com
speecha.com
digitalpodcast.com
getpodcast.com
podcast.com
podcastexchange.org
podcastpickle.com
thepodlounge.com
everypodcast.com
odeo.com
podcastalley.com
podcasting-station.com
rss-network.com
iPodder.org
PodcastDirectory.com
ipodderx.com
