I had a look at the Audio MicroContent Client Application Songbird. This application falls in the category of iTunes. It seems like a pretty complete application and introduces some interesting new features.
The most prominent one is the integration with a web-browser. One can use the application to browse web-sites. This sounds weird until one browses pages which include MP3 links. The application detects these links and shows them as a list of audio Items. Clicking on one item start playing the corresponding audio file.
So think as these audio files as attachments to web-pages. One can not call them microformats as the files themselves are not embedded in the web-page. And think of the web-page as a List, as a Playlist. In this way the web-page becomes some kind of metadata related to the playlist.
I thinks this approach is interesting and introduces some new conceptual ground. And natutally the integration with the web in a standard way makes it very interesting.
And they are only on version 0.2 and it seems to work well. I will check it in some more detail in the future.
By the way I *hate* the interface, very unMac-like. For me a reason not to use the app.
[Inspiration Read/Write Web]