Ideally there would be a way to 'cite'/'quote' another comment/idea so people can follow the connections. i.e. i'm not responding to earlier responses; i'm responding to the original question, and it would be good if i could connect this post with that question. right now, the only way you can tell who is talking to who is by counting the number of 're:'s in the title.
this allows new ways of ordering/sorting/linking things, rather than just in chronological order. it allows users to link relevant ideas themselves.