Podcast Alley
The best site to find all your podcasts, podcast feeds, podcast definitions, podcast software and best podcast directory.
http://www.podcastalley.com/

Podcast Blaster
Offers everything you need to get podcasting today.
http://www.podcastblaster.com/

Podcast.com
The ultimate podcast collection. Find podcasts from around the world. Play, collect, download and share any podcast.
http://podcast.com/