Login Without Using Keyboard Or Mouse: Luxand Blink!
Luxand Blink is a free software that lets you login to your PC by using Webcam and Facial Recognition.
We do not use webcams here and even if we did I don't think it would be recommended for network logons.
This adds an extra layer of security to your computer and a more secure way of logging into your system. Some may be inclined to call it a bit of a novelty product, but for many it is a viable, efficient, and secure way of logging into the system. This is especially useful on those computers that do not have advance login features, like Fingerprint recognition.
However I suppose that someone will find it of interest?
Link: Luxand - Blink! - Login to Your PC by Simply Looking!
Edit: Supported OS: Windows Vista and Seven 32bit only.