Loomia has an unusual personalization feature, recommendations based on the podcasts you rate. From their About and FAQ pages:
Loomia provides search, recommendations, and personalization for podcasts and videocasts.I'm not much of a fan of podcasts -- I find they take too much time to listen to -- but I did try it out.
Rating podcast channels and items tells the recommendation system what you like and don't like. The more information that the system has, the better recommendations it can provide. Ratings also factor in whether a channel or an item is a top-rated one or not.
Loomia easy to use and, impressively, is able to make reasonable recommendations even with just a few ratings. It seems like a useful way to discover interesting podcasts that might be difficult to find on your own.
In my experiments, however, the recommendations seemed a bit slow and seemed to tilt toward popular items and away from the tail. It is difficult to determine if these are a widespread problems.
Nevertheless, this looks like a promising effort to help people cut through the crap and surface good podcasts.
See also reviews of Loomia by Michael Arrington and Alex Williams.