Thought crossed my mind: a lot of people have sites or startups they would like to publicize once or twice. Perhaps that could get its own category? You could have a karma-cutoff to keep out spammers.

Perhaps this would also make the site feel that much more 'inclusive' of those who aren't in the YC program (and may have no intentions of attempting to participate), which was a request a while back.

Just a random idea.