email.Utils.formatdate documentation does not mention that 
'usegmt' keyword argument is new on Python 2.4.

reference:
http://python.org/doc/2.4.1/lib/module-email.Utils.html
http://python.org/doc/2.3.5/lib/module-email.Utils.html

I don't know if its the rule, but usually the docs warn about new 
additions, and its very important when you try to create code that 
should work on multiple Python versions.

Suggested fix
replace:
"Optional usegmt is a flag that when True, outputs a date string with 
the timezone as an ascii string GMT, rather than a numeric -0000. 
This is needed for some protocols (such as HTTP). This only applies 
when localtime is False"

with:
"Optional usegmt is a flag that when True, outputs a date string with 
the timezone as an ascii string GMT, rather than a numeric -0000. 
This is needed for some protocols (such as HTTP). This only applies 
when localtime is False. New in Python 2.4."

Logged In: YES 
user_id=44345

Fixed in 2.4 and CVS docs.  Thanks.