ptw has adapted the OPML viewer to display his currectly playing iTunes. (PC users have to go find a Mac to see it.) The integration with iTunes via AppleScript is the new special sauce. As you can see from the code, the app still imports OPML and the LZX changes are purely user interface. Read more about how it was created on his blog.
You can see what I’m playing from a PC — the only thing missing is that the links won’t take you anywhere as they are links to the iTunes music store, which only work on a Mac (today).