Marco Fucci @ http://www.marcofucci.com/tumblelog/26/jul/2009/integrating-recaptcha-with-django/
This version requires a custom version of the python-recaptcha library to provide ssl support for submit. You can get the required version here:
http://github.com/bltravis/python-recaptcha
Add a new setting to your Django project settings file (eg.):
RECAPTCHA_USE_SSL = True
If you don't add this setting, the code is written to default to NOT use SSL.