Ratings and recommendations would be nifty I guess, but I've wanted a one stop shop for podcasts with a clean and consistent layout for a long time. I mean, one that doesn't make me install a bloated program that I don't want to use.
This one's checked off, my other podcast wishlist items:
1) autotag my podcasts by parsing their RSS feeds
2) a head unit in my car that would connect to my wifi from my driveway or garage, then automatically download new episodes of subscribed podcasts every night or morning. Ideally I could manage my subscriptions on my PC through a website or through a settings page the car offers to my network, so I'm not forced to use the limited controls of a car to manage podcast subscriptions. (Maybe everyone else solves this problem by just keeping an iPhone with unlimited data in their cup holder.)
Staying on topic - this site is great so far and looking forward to seeing more features added. Really agree that a top X by category and 'similar to' rating system would make this pretty killer.