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.
Psychedelic means something that causes a profound change in thought patterns. In anything beyond a mild dose, cannabis induces profound changes in thought patterns.
There are plenty of legal plants that contain illegal psychedelics. These plants are legal to buy, grow, and sell, but they become illegal if you possess them with the knowledge of their use. It is an actual thoughtcrime (in the USA).
All can be purchased online by searching Google.
A lot of places avoid the "thought crime" problem by making the live plants legal but their products illegal. For example, in places where psychedelic mushrooms grow naturally, it is often legal to have them fresh but illegal to have them dried, as one would only dry them in order to use them but you wouldn't want to arrest an old lady for having a lawn.