Hi all,
with few free hours, I have modified the windrose file to be O.O. compliant with the 0.98 matplotlib branch and normally bug free. The next posts will be on sourceforge :
https://sourceforge.net/project/showfiles.php?group_id=239240&package_id=290902
and to see it in detail, here is the entry on blogspot:
http://youarealegend.blogspot.com/2008/09/windrose.html
All suggestion welcome (even to correct my bad english 
)
Thanks to the best python plotting library and the matplotlib team!
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Lionel Roubeyrie