A place to discuss potentially promising methods of intelligence amplification in the broad sense of general methods, tools, diets, regimens, or substances that boost cognition (memory, creativity, focus, etc.): anything from SuperMemo to Piracetam to regular exercise to eating lots of animal fat to binaural beats, whether it works or not. Where's the highest expected value? What's easiest to make part of your daily routine? Hopefully discussion here will lead to concise top level posts describing what works for a more self-improvement-savvy Less Wrong.
Lists of potential interventions are great, but even better would be a thorough analysis of a single intervention: costs, benefits, ease, et cetera. This way the comment threads will be more structured and organized. Less Wrong is pretty confused about IA, so even if you're not an expert, a quick analysis or link to a metastudy about e.g. exercise could be very helpful.
Added: Adam Atlas is now hosting an IA wiki: BetterBrains! Bookmark it, add to it, make it awesome.
I think you're saying what I mean, but I'm not quite sure, so here's how I came at it:
Evolution relies on mutation, and mutation is random. If a certain feature is currently observed, that doesn't mean the mutation has already occurred and been selected against; it might just not have occurred, or not widely enough to catch on. For example--just because skinks lay eggs doesn't mean live birth isn't a good mutation for some of them.
In general, I don't know that it's ever accurate to talk about evolution in the past tense when referring to a living species.