Second, it's much easier - for me at least - to
flip through a PDF than
 it is to flip through microfiche.  Right now, I don't have a fiche
 viewer at home (despite the DEC MDS fiche I now have) so I have to make  
I'm the reverse. I have a fiche reader here (it meets my criterion of
being possible to repair :-)), I have no easy way to 'flip through' pdfs
(and I certainly don't feel like downloading them on a 14K4 modem...)
I've found that I can tell what the pages on a fiche are -- whether they
are text, program source, or diagrams with my naked eye. Very useful to
see if a given fiche contains the schematics...
  a trip to the library to view it.  It's much
easier to print out a few
 pages of a PDF (or all of it) and bring it with me to look at, than it
 is to haul around a microfiche reader...  
It's a pity standard fiche is larger than 5*4"....
-tony