LaTeX.org

Yes, I've read Wilson's memoir class manual.

I've been wrestling with this for some time now, but the stuff on 306-307 just isn't working for me.

i.e.
\makeindex
\makeindex[lines]
% in body
... index{main} ... \index[lines]{First line}
...
% at end
\clearpage
% main index
\pagestyle{Index ...