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 Here is a small summary of the remark made arround 
the she-bang modification of the windows platform.
1. Trent let us know that the she-bang modification 
works only for the win nt sons and that in general it is 
better to use the .bat extension instead of the .cmd one
2. I realize that we shouldn't change the extension of a 
script if it exist since the extention could be usefull to 
determine which version of python to run
 - pythonw for the .pyw extention
 - python for the .py extention
According to these remarks and in the purpose to be 
as conservative as possible I make this another 
proposition:
The change in the she bang will happend only if
 - the win32 platform is detected (os.name == "nt")
 - the platform is win NT son (os.environ["OS"] == 
"Windows_NT")
 - the original script had no extension (os.path.
splitext(outfile)[1] == "")
Furthermore I add the %* in the new nt she-bang to let 
the underlying script know about command line 
argument.
such that the unix she-bang:
 #!python foo bar
will become:
 @C:\Python24\Python.exe -x "%%~f0" foo bar %* & 
exit /b
I think that in these conditions the change could only 
improve the existing situation at least it improve for 
some them (Zope, Chetaah, PyCrust, IPython)
Tell me what you think about the proposed change.
Vivian.