The Eclipse editor and the Pydev plugin (open source) provides a very powerful IDE for Python.  The Autocompletion functionality is extremely useful.  My goal was to access the Maya Python API through the same autocompletion.  However, the .pyc API files from the Maya release do not provide the python introspection attributes required for this.

These files are generated from the actual Maya documentation and enable full Autocompletion for the Maya 2009 Python API for the Eclipse editor.

For usage, see the tutorial here on Highend3D,

http://highend3d.com/maya/tutorials/using_tools_scripts/Using-Eclipse-as-a-Maya-IDE-367.html