Ok, I have in fact managed to provide incorrect data based on my 
meddling with the source.
Furthermore, the patch I offered for the 64-bit make_method was also 
broken, I have attached the corrected version.

To the problem at hand:
The return type expected is PROPVARIANT, however when I return (a string 
in this case) I receive trace about VT_RECORD
VT_RECORD = 36 (0x24)

How would I proceed?

#############

__init__
Initialize
GetValue: {4DFCB999-F66E-45E1-82D0-9B27FAB443A1}100
pythoncom error: Failed to call the universal dispatcher

Traceback (most recent call last):
  File "C:\Python26-64\lib\site-packages\win32com\universal.py", line 
193, in dispatch
    WriteFromOutTuple(retVal, meth._gw_out_args, argPtr)
TypeError: The VARIANT type is unknown (0x24).
pythoncom error: Unexpected gateway error

Traceback (most recent call last):
  File "C:\Python26-64\lib\site-packages\win32com\universal.py", line 
193, in dispatch
    WriteFromOutTuple(retVal, meth._gw_out_args, argPtr)
TypeError: The VARIANT type is unknown (0x24).
__del__

#############