idolw - 6:24 am on Jul 22, 2008 (gmt 0)
if it's thousands - yes, everything works if it spread across the world.
if it's tens or hundreds - well, quality works better here.
As for PR5 directories with PR0 categories. Don't they have some crazy names, not really connected to "directory"? I've seen many new directories set up on expired domains with high PR just for link exchange purpose.