> Another issue I was pondering was whether the resolution of 
> the camera could be improved by taking a shot, moving it a 
> fraction of a pixel, taking a shot, moving it a
> fraction of a pixel, .......   Would it be possible to compute sub- 
> pixels by doing this ?

A guy named Steve Mann at a university in Toronto did that for an eyeglass
mounted low res camera. He was able to not only vastly increase the
resolution of the photo but also compute the amount of movement from the
overall change in pixel levels so that no mechanical position feedback was
necessary. As he would sweep his head from side to side, the system would
provide head tracking from the over all change in the pixels and then go
back later and compute sub-pixels from the frames to build a high resolution
image.

Googleing:
http://en.wikipedia.org/wiki/Steve_Mann
http://eyetap.org/publications/index.html (appears to be down)
http://wearcam.org
http://wearcam.org/tip.ps.gz I think this is the one you want.
http://wearcam.org/wyckoff/index.html or this one??
http://hi.eecg.toronto.edu/orbits/orbits.html Ahhh, no here it is! This is
the one. Orbits.

P.S. Steve Mann is a true hero of mine. Brilliant, unconstrained by
convention, one step ahead on the evolutionary ladder. 

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