I have been following the PyObjC development for a few years now. I think I even have commit privileges at sourceforge. But unfortunately I haven't had any projects which would allow me to build a GUI application that runs only on Mac OS X. I have been following the mailing list with great interest, and now that I have some time off I got a chance to play with it, finally.
This is everything I dreamed could be possible way back in the Rhapsody days -- a truly RAD, truly OO GUI development environment, so far ahead of anything else it's mind boggling.
Needless to say, I will be producing some applications immediately.