PyObjC for Mac

From bbum:

PyObjC is a bridge between Python and Objective-C that allows full featured Cocoa applications to be written in pure Python. It can also be used with other Objective-C class libraries, as well as C and C++ source. The installer package includes a number of Project Builder templates and Python syntax coloring files. It supports full introspection of Objective-C classes and direct invocation of Objective-C APIs from the interactive interpreter.

Project Builder Support is provided. The Cocoa developer can use Python as the language of implementation for production quality / full featured Cocoa applications.