Good thing. Now we can integrate the proprietary part in our preferred clients as plugin instead of having to rely on a proprietary, closed source pile of xing. Good for portability, more freedom for users to decide over interface. Hopefully it won't become a Second Helix where nobody gives a rat because the only interesting part still closed source of RealPlayer are the proprietary codecs which may not be used by anything else than Helix or RealPlayer.