Empty pages in search results

Andrew Orlowski is right, there are too many blank "Discussion on..." pages in Google results, but only if you're using search words like 'discussion', 'trackback' or 'comments'. On the flip-side, I've been noticing the advantages of embedding comments and trackbacks in single-post archive pages - commenters leave lots of extra keywords that you might have missed, and Google indexes all these along with your original post. Bonus added value, or something.