It's a fairly (and surprisingly) short list of shows, the list being contained in the left hand column. There's a strict screening process before your podcast can be listed. Wait, the short list of shows is just the most recently visited ones. It's not clear how to view the whole list of all podcasts they index as there's no overall topic directory.
Each podcast listing shows a listing of the items in that feed. The item has a description clearly coming from the feed.
There is a tagging system to help you find items related by their tags.