(this is an idea for Python 3)
Is there any reason for keeping the directory lib-tk at Lib ? I believe renaming it to tkinter and making it a package would make more sense. Tkinter module's code could then reside into __init__.py maybe. Other change that could be done in this package would be renaming some modules:
Dialog -> dialog FileDialog -> filedialog FixTk -> fixtk ...
Also, I believe tkSimpleDialog and dialog could be in a single module. There are other modules like tkColorChooser and tkCommonDialog and even tkSimpleDialog (and some others) that I'm not totally sure what to do about them, but for me they should reside in possible a single module.
That is. Thanks,