[mdipierro]

You can easily modify KPAX (http://www.vimeo.com/1098656) to do what you need, and more. kpax is based on web2py (http://mdp.cti.depaul.edu) and you can download it from here (http://mdp.cti.depaul.edu/appliances/default/show/37).This (http://mdp.cti.depaul.edu/AlterEgo/default/show/99) shows how to add captcha. I will help you more if you sign up for the web2py google group.