I recently found a use for the webcam on my gaming laptop: a free open source software for controlling the in-cab camera with your head. Much like TrackIR, but without its fancy hardware.
Check it out here: http://facetracknoir.sourceforge.net/home/default.htm
It makes use of the TrackIR interface built in Railworks.
After some tweaking of the curves, it works rather nice. I kept the yaw and pitch limited to 45 degrees either direction initially.
