Resources for Face Detection

I always had some interest in working with faces :B - yeah face detection and recognition. following is a list I have found once on the internet; thought might be helpful for me someday when I'll get some time to work with seriously :S.
Face detection (or more generally Image Matching resources):
AForge.net
Facedectection in C# with less than 50 LoC
http://friism.com/facedectection-in-c-with-less-than-50-loc
Face Detection in (pure) C#
http://askernest.com/archive/2008/05/03/face-detection-in-c.aspx
Easy to use Wrapper (DLL) for Intel’s OpenCV Library with Examples
http://www.codeproject.com/KB/cs/Intel_OpenCV.aspx
OpenCV (Open Source Computer Vision) for C#
http://coolthingoftheday.blogspot.com/2008/08/opencv-open-source-computer-vision-for.html
OpenCVDotNet
http://code.google.com/p/opencvdotnet/
Emgu CV
http://www.emgu.com/wiki/index.php/Main_Page
SharperCV Project
http://www.cs.ru.ac.za/research/groups/SharperCV/
[C#] OpenCV
http://www.dotblogs.com.tw/chou/archive/2009/06/13/8812.aspx
Webcam in C#: with OpenCVDotNet
http://haryoktav.wordpress.com/2008/12/12/webcam-in-c/
OpenCV / SURF How to generate a image hash / fingerprint / signature out of the descriptors?
http://stackoverflow.com/questions/2146542/opencv-surf-how-to-generate-a-image-hash-fingerprint-signature-out-of-the-d
Face Detection and Identification
http://www.emgu.com/forum/viewtopic.php?f=7&t=11&start=10
Phase Correlation in OpenCV
http://nashruddin.com/phase-correlation-function-in-opencv.html
SURF and OpenSURF
http://amitsarangi.wordpress.com/tag/opencv-features/

A proprietary tool but had a lot of fun with the following tool:
http://www.luxand.com/