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.
Yes, on most days I have no caffeine. I frequently go 2-3 weeks without taking any caffeine at all except for, say, a fun-sized dark chocolate bar. I do not drink soda, take caffeniated pills, drink office coffee, or have access to other popular surrepetitious sources of caffeine, so it is unlikely that I am in denial about my caffeine consumption.
I do not have an objective measure of alertness, but I have been successfully confused by what appeared to be aytpical levels of alertness after misestimating the amount of caffeine in, e.g., a Grande Starbucks Frappucino (~120 mg vs. my estimate of 50 mg), gone back and checked the actual caffeine level, and found that it predicted my past alertness better than my estimated caffeine level. This happened twice with two different types of caffeniated beverages, both at times when I was habitually using caffeine at roughly the same dosages per day as the beverages in question.
This is a sufficient answer to my comment as well.