Every time there is an edit, no matter how small, the article shows up once per edit in my RSS feed. I think edits should be kept to a minimum or not published multiple times.
I de-dup based on both title and URL such that changing one won't cause me to see it again unless the other is changed at the same time; it seems to help.
A really cool idea would be a site where people can submit anything they want with any title they want, and users' votes will determine how the stories get sorted. That way, the community could easily express and realize their preference for titles by upvoting the ones they prefer.
The problem with a system with no moderation is that the abusers of the system have more time and incentive to abuse than the community does to moderate.
