Right now, we've developed Winamp support for gdTunes, so the upcoming version supports iTunes and Winamp. While there isn't an API to add media player support to gdTunes yet, adding support for additional players is quite simple. If you would be willing to develop a backend for Rhapsody, we'd work with you to incorporate Rhapsody support into gdTunes. gdTunes is developed in C++. While many of the features in gdTunes can be recreated in a standard plug-in using scripting to the helper in C++, gdTunes features a completely custom-drawn user interface, so it support ratings and album art, which would otherwise be impossible. Also, the next version of gdTunes will be available in English, Spanish, French, German, Russian, and Italian, so it's compatible across much of the world. Please let me know if you're interested in working with us to incorporate Rhapsody support: http://www.airbearsoftware.com/contact