Reddit-style posting is basically the same format as comment threads here, it's just a little easier to see the threading. One thing that feels awkward using threaded comments is conversation, and people's attempts to converse in comment threads is probably part of why comment threads balloon to the size they do. That's one area that chat/IRC can fill in well.
Another issue is that top-level posts have a feeling of permanence to them. It's like publishing something. I'd rather start with an idea and be able to discuss it and shape it. Top-level posts seem like they should have been able to be exposed to feedback before being judged ready to publish. I'm not really sure what kind of structure would work for this, but if I did, I probably would have jumped into an open thread or a meta thread before now :)
Another issue is that top-level posts have a feeling of permanence to them. It's like publishing something. I'd rather start with an idea and be able to discuss it and shape it. Top-level posts seem like they should have been able to be exposed to feedback before being judged ready to publish. I'm not really sure what kind of structure would work for this, but if I did, I probably would have jumped into an open thread or a meta thread before now :)
Google Wave is decent for this - it's wikilike in that document at hand can be edited by any participant, a...
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.