Captive Portal + Active Directory Authentification [50$]
web conf xml + log file
Are you being serious? If this is a serious bounty, please describe in_detail what it is you want to accomplish with this bounty.
You can already authenticate captive portal using Active Directory, using RADIUS.
Take the $50, go buy the pfSense book when it's available in about a week, and you'll find out how and still have about $10 left. :)