I haven't read the above thread. But here's an idea I had about the Karma system: If you want to downvote someone you're asked to provide a reply explaining why you downvoted the comment. If you downvote 5 times without explaining yourself you'll lose 1 Karma point.
It always really bothers me if I get downvoted without getting feedback because without feedback I'm unable to improve, refine my writing skills or rationality. What's the point then? Merely losing Karma score will led people to conclude (unjustified) that they are downvoted for various reasons but not that they may be wrong or that their comment simply does not add anything valuable to the debate. Negative Karma without feedback causes resentment in all people except those who already acquired enough rationality skills and realization to infer that there might be something wrong with their comment and not with the person downvoting it. The Karma system as it is will therefore discourage newcomers and make them conclude that LW is merely an echo-chamber and does not tolerate their precious critique.
I'd like to see total upvotes and downvotes, not just the sum.
I thought for a minute that votes made using the kibitzer could count for more. But this would be a feature that would favor dishonest users (who could game it) over honest users.
[Update: and now there's a fifth discussion thread, which you should probably use in preference to this one. Later update: and a sixth -- in the discussion section, which is where these threads are living for now on. Also: tag for HP threads in the main section, and tag for HP threads in the discussion section.]
The third discussion thread is above 500 comments now, just like the others, so it's time for a new one. Predecessors: one, two, three. For anyone who's been on Mars and doesn't know what this is about: it's Eliezer's remarkable Harry Potter fanfic.
Spoiler warning and helpful suggestion (copied from those in the earlier threads):
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.