GTK+OSX has released a native Mac OS X Aqua port of the Linux-based GTK+ open source graphical user interface library. GTK+ (GIMP Toolkit) is a popular widget library supporting graphical applications for Linux. GTK+OSX version 0.1 is an alpha release intended for developers." This could make The Gimp cozy for MacHeads without installing XDarwin and OroborOSX. The next milestone they are wanting to accomplish is to get FilmGimp completely ported over to run on OS X native.

http://apple.slashdot.org/apple/02/12/31/149202.shtml?tid=179
http://www.osxfaq.com/Press/12-31-02/gtk-12-31-02.ws