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In their own words, "Castpost currently includes Castpost Hosting, a popular video hosting services for user-generated content. Castpost Hosting is in Alpha, and people all over the world use Castpost to share their personal video and audio clips with friends and family." Just how popular, we don't know yet.
The good part - you can customize your personal page to have only audio files (as well as a mix). This one is a good example. Tyromaniac is an example of mixed audio and video on a page. But these features don't pack anything special really.
TechCrunch calls such video sharing services The Flickrs of Video and I'm sure the other services mentioned in his post are much better than Castpost at what they set-out to do. It's got the lowest storage space available to users, doesn't convert the format (flv/flash/3gp). You can still share via RSS though, but maybe some more work and the service will be fully baked. Another two years maybe?