For close proximity you'd most likely want to shift both left and right from a
central spot.  As simple as adding and then subtracting a number from the x
value in the camera location and look_at vectors.
The average human eyes are separated by about 2 and a quarter inches I think it
is, so a 1.125 inch shift for each ought to do okay if you apply that to the
scale of your scene.
There are differing ways of doing the stereo pair; some say to look past the
"focus" so that location/look_at have same change, and others say to have a
focal (not the best word for it) point where the look_at remains fixed and only
the camera location moves.
Keith Rule, author of the Crossroads 3D file format convertor, has something
written up about stereo-pairs: http://www.povray.org/povzine/povzine2/3d.html

Bob

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