Digital BW, The Print

I've been messing with this free 30 day download for converting 
color files to b+w.   It operates on the theory that the user is 
versed in the traditional b+w darkroom.  It gives you previews for 
your image at various printing filter grades using the Ilford 
multigrade numbering system.   It also shows what your file 
would look like if it was shot on various b+w film stocks. 

Check it out if you haven't already tried it.

http://www.theimagingfactory.com/

Go to product list.  They also have a lot of other plug-ins that I 
have not tried.

Frank

http://www.culturalvisions.com