The Logitech Quickcam Orbit has face tracking software: perfect if you pace around while having online sex with random strangers. Available for $111.99 with free shipping from Amazon.com.
Always stay in the frame thanks to the automatic face-tracking software and mechanical pan and tilt feature
Record high quality videos at true 640 x 480 resolution with the high-quality CCD sensor
Capture 1.3 megapixel photos
Works with both USB 2.0 and 1.1
Compatible with Windows 2000, Me, XP, and Mac OS 10.1.5 or higher