Digital BW, The Print

Those interested in dynamic range and A/D conversion may be interested  
in the material here:

http://www.normankoren.com/digital_tonality.html

Personally, I think that in order to preserve the maximum amount of  
information through the analog to digital conversion (whether that is  
done at the scanner from high bandwidth film or from the high  
bandwidth scene direct to digital) one will only retain maximum  
information with multiple exposures.  After all, a scanner merely  
projects light towards film and measures the output.  Not that much  
different from direct digital capture.  If the camera/scanner has a  
high bit depth it can capture more levels within the range and allow  
more room for maneouvre within Photoshop before degradation occurs.   
If you have two exposures then you can compress those exposures with  
more artistic freedom.