I can vouch for FaceTrackNoIR's awesomeness.
It's a great alternative to those who don't want to spend a bunch on TrackIR or want to try out the whole headtracking thing before purchasing hardware.
FaceTrackNoIR is freeware, requires only a webcam (PS3 Eye for best results), and a human(?) face.
Works great and smoothly once you dial your settings in.
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