Well - Sort of http://facetracknoir.sourceforge.net/home/default.htmIf you have a webcam setup, this will pan the screen by recognising face movement.
Seems cheap for £10 http://www.google.co.uk/products/catalog?hl=en&q=webcam&sqi=2&cid=1639333939328942718&ei=IewuTb_FHaDs2QTxhYDVCg&sa=title&ved=0CAkQ8wIwADgA#p best wishes Kev