CastRoller is a site built by William Spaetzel to make it easy for you to find and manage great audio and video content on the web. Amongst many other features, it allows you to easily create and subscribe to custom podcast feeds - you can pick and choose individual episodes, and/or merge entire streams! The site is currently in private beta.

Earlier last week Will released a nifty new feature: PostRank filtering for your podcast queue! Now you can optimize your podcast experience and ensure that you are listening to the best audio content available. You can either apply the PostRank filter to an entire channel, or preview and pick and choose specific episodes (see screenshots above).

Looking at my iTunes library, which tends to accumulate 20+ hours of podcast material each week, this is going to be a life savior, and an amazing new tool!