To echo others: I love the concept for this, but I do not think the current implementation is successful. I put in The Lowe Post (a fairly popular ESPN basketball podcast) and got:
1. another basketball podcast (nice!)
2. a podcast about outdoor camping
3. a podcast about Ohio State University sports
OP: what I'd _really_ love in this vein is a way to go from "here's a podcast I like and listen to, give me a list of podcasts in which the host or guests of the host also appear." I suspect that may be a difficult set of structured data to assemble, but I think it'd be very valuable.