Hello,
This is post to introduce a new application, Face Authentication On Linux ,

Developed during the Google Summer of Code Program in 2008 under openSUSE and in 2009 under Pardus , mentored by Alex Lau, Novell and Onur Kucuk, Pardus respectively.

http://code.google.com/p/pam-face-authentication/ ,

it is a pluggable authentication module for linux for doing face based authentication. The newest release V 0.3 was made around 15 days ago , fixing most of the bugs ( still one or two remains) , but mostly stable.

Installation Instructions
[1] http://lifeasiknow-it.blogspot.com/2009/08/pam-face-authentication-musings-how-to.html

User Interface for Face Training
[2] http://lifeasiknow-it.blogspot.com/2009/08/pam-face-authentication-musings-ui-and.html

Brief theory about face verification and tracking [ not exact ]
[3] http://lifeasiknow-it.blogspot.com/2009/07/pam-face-authentication-musings-face.html
[4] http://lifeasiknow-it.blogspot.com/2009/07/gridsearch_27.html

Some youtube videos OLD ones are on the project website.

Thank you