With the nf-blank.1 below,

    (woman-find-file "nf-blank.1")

produces

          Unfilled line 1.
          Unfilled line 2.

where I expected there would be a blank line in between, corresponding
to the \& line.

I think woman.el.nf-blank.diff below could correct this.

2012-05-29  Kevin Ryde  <user42@zip.com.au>

	* woman.el (woman2-process-escapes): For .nf preserve newline
	following \&.  Fixes blank lines in perl pod2man "verbatim" blocks.


Perl pod2man makes such \& lines for blank lines in "verbatim" blocks
(usually sample code etc).  Dunno if it really needs to do that.  Maybe
it distinguishes line spacing from paragraph spacing in troff or
something.  In any case for woman I don't think a \& on the line should
remove it.