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As a software engineer, I appreciate how difficult some seemingly simple tweaks can actually be. I am enjoying the tweaks to SSI thus far, (as much as I am annoyed at the tweaks the keep making with Facebook).
The balance of keeping new threads and old available is not easy. I think MY approach would be to display 3 comment numbers: total, last day, last week -- and then poster name (first line) just for the past 3-5 comments per thread. But, all in all, I like the direction.