This is probably of interest only to the old-timers here. (Ironically, as a cross-post, this is almost by definition spam for LW, since anyone really interested in the topic would already be subscribed to SL4 and would have seen the emails.)
In 13 March, I finally got around to a long outstanding bit of cleanup: suggesting that the equally long defunct SL4 list be formally closed, things tidied up, and the lights turned out. The suggestion met with a mixed (and muted) reception.
Last night I followed up with a second email comparing SL4 activity to activity on Extropy-chat, LW, OB, and MoR; it won't surprise anyone trying to drink from the firehose here that LW is approximately 3 orders of magnitude more active than SL4 is.
It would be interesting to have old-time SL4ers write an essay on lessons learned with running SL4 and what LessWrong does better or worse than it. Trivial inconvenience was more of an OB problem, I think; lack of moderation or links, and repetition, were bigger problems for me.
It'd also be a good idea to compile a categorized 'best of SL4' list of emails; for me, the worst part of SL4 was how repetitive a lot of it was (and how incredibly frustrating John Clark was with his obtuse misunderstandings of basic CS), which such a list would cut through. (As cousin_it mentions, before OB started, there was a lot of good discussion on SL4.) I might do this at some point if I ever finish a similar project of mine, reading through the archives of the Neon Genesis Evangelion ML - no promises though.
We have that here, too. (It's probably less frequent here.) Sometimes the misunderstandings do not get downvoted or pointed out, sometimes they do, but the negative scores and replies do not prevent the person from continuing to go on copiously and with confidence about the subject he misunderstands.