even you cannot keep track of nodes you've read, so how can the system? the site can know if you visited the node, but cannot know if you've read it, you can even read it, but miss a reply, next time, should it be marked read?

If it has been displayed as a whole, yes. It was on a page you've seen.

I don't know about other's opinions, but I feel it's a feature that's not worth the trouble (it needs a radical change in users database tables, not a simple patch), so I vote no.

I'm not so convinced it's such a radical change, any more. In fact, it could piggyback on the votes database table(s). If you voted for a node, you must have "read" it, yes? So add a vote status value: 1 for ++, -1 for --, NULL for not visited, all as before, and add a 0 for visited but not voted.

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