Hi,
I recently donated to support your great work on Gimp.app
I really like that you have been working on a Native version that no longer requires X11.
There has been a .app version of Inkscape for a long time, but it also requires X11. They do have instructions for compiling against non-X11 versions of libraries, but this requires mac ports to be avaliable and doesn't produce a stand alone, easily distributable .app
It would be great if you could combine your expertise at getting GTK+ based applications working on OSX with Inkscape to produce a non-X11 .app for Inkscape, and I'm sure it would encourage more donations and support for your work.
Here is Inkscape's instructions on complilation:
http://wiki.inkscape.org/wiki/index.php/CompilingMacOsX#Compiling_Inkscape_with_native_GTK_using_MacPorts_.5Bexperimental.5D
I've reaised that someone has already started trying this:
http://www.flyn.org/apple/index.html