Many years ago when I heard podcasts were becoming available I knew it was only a matter of time before content was available to match my interests. <sigh> Well, it's definitely happening and since I got my Zune I'm hooked. I'm still playing around with different receivers but I keep coming back to IE7. It gets the job done without an extra app. Once RSS Bandit adopts the central OPML in Vista I'll probably go back as it has been my choice for quite some time.
A couple of thoughts
I won't point you directly to the podcasts but here are some of the sites that host them