Digital BW, The Print

That is indeed an interesting site.  There is a "zone system" curve for
download.  The diagonal is divided into zones 0 through 10, and as you mouse
over the image the particular zone is highlighted on the diagonal.  I'm more
of a visual person and thought it was very helpful in seeing the range with
which to work.  

Regards,

  --Ken Carney
    www.kencarney.com 

> Here's a great new site, created by Thomas Zuber, for 
> learning PS basics like histograms and curves, relative to 
> photography:
>  
> http://www.zuberphotographics.com/page_PSTopics.htm