This is a tiny app that you can drag into your Mac's Dock as a quick way to start iTunes playing the WFMU 128Kbps Internet audio stream (http://wfmu.org/wfmu.pls).
You must first have had iTunes launch the stream once, so it's in iTunes's Music collection.
See WFMU's web site, http://www.wfmu.org, for information about why you might or might not want to do that.