Mythic-beasts.com: X-Face
Includes a brief explanation of the X-Face format and an online Jpeg to X-Face converter along with its source code.
http://www.mythic-beasts.com/tools-toys/xface/

2 Rad
2 Rad, the only place you'll ever need to go for the best windsurfing equipment. 15 years of experience, the best before and after sales service, at the most competitive prices. We are exclusive for most of the top brands we carry.
http://www.2-rad.com

MessageFaces
Extension that adds X-Face and Face image compatibility to Mozilla Thunderbird. Also hosts a FAQ and a quick guide for Face image creation.
http://tecwizards.de/mozilla/messagefaces/

Face Expression Recognition Project at UPM
Computer Vision-based face expression recognition research project. We are doing robust face tracking, background maintenance, colour constancy based tracking, face expression recognition, or camera calibration.
http://www.dia.fi.upm.es/~lbaumela/FaceExpressionRecognition

Face Detection and Face Recognition
Betaface is a provider of facial recognition solutions for video and image content
http://www.betaface.com

The Face Header
A proposed improvement to the X-Face header. The Face header is a PNG image whereas X-Faces are one-bit images.
http://quimby.gnus.org/circus/face/

Intrado Inc.
Provides 911 operations support systems services to incumbent local exchange carriers, competitive local exchange carriers and wireless carriers. (Nasdaq: TRDO).
http://www.intrado.com/

Face To Face Communications
Videoconferencing over low cost international ISDN, and multipoint bridging.
http://facetoface.biz/

NIST FERET
Standard face database for the evaluation of face recognition systems.
http://www.itl.nist.gov/iad/humanid/feret/

BIK Umfrageforschung
BIK Umfrageforschung
http://www.aris-umfrageforschung.de/