I see it is possible to view a list of properties set on every directory within an SVN repository using proplist and the -R flag (recursive) and -v flag (verbose):
Sorry to jump in here late, but there is a simple solution here.
Just grep.
svn proplist -Rv | grep svn:ignore -B1 -A1
Show one line before, and one line after the match.
svn pg -R svn:ignore .
...with pg
being a shorthand notation for propget
, so this is equal to...
svn propget -R svn:ignore .