If you benefit from web2py hope you feel encouraged to pay it forward by contributing back to society in whatever form you choose!
Create a custom decorator which can be used to authenticate a web2py service or page access. ...
Now (1.99.6) you can restrict login access based on ldap groups where the user is a member and automatically manage ldap groups in web2py app's db. ...
Authenticating with Facebook Connect, Twitter API, and/or Google accounts. Working on and off of Google App Engine (GAE) ...