Netvibes offers a very nice user interface for listening new podcasts. All subscribed podcasts appear in a basic rss-feed form, but there are two buttons for each entry: “listen” and “download”.
Basically you can stream every podcast which sounds interesting before downloading it. As I’ve subscribed to nearly 30 different podcasts, it took all my bandwidth to download all the new casts everytime I opened iTunes. I’m more than happy to select the best mixes using this interface and leaving iTunes just for my music library.