Can you give an example of the kind of thing you use this to record? Is it for ideas, new concepts, notes to self, things to do later ... ? What kind of things do you save, and how are they useful?
I was thinking about something similar recently, although I came at it from a different direction. Every once in a while I'll think of something I call a "puzzle piece"--a bit of my own personality, or a rationale for something I do or feel. A piece of the puzzle that is me. Examples are along the lines of "Oh, I just remembered this experience I once had regarding such-and-such; no wonder I react to such-and-such so strongly now."
I usually talk to someone about the puzzle pieces in a logged medium, but I don't otherwise record them. It occurred to me that if I did, I'd be writing a manual to myself, and that might be very handy. Would anyone else be interested in some kind of structured site with the purpose of helping people develop their own "manuals" in this way? I'll need to think about the requirements a little more before committing to building it, but I'm tentatively interested, especially if someone wants to help. (It wouldn't be IA specifically, but self-knowledge is a useful thing.)
It's also possible that the right format for this would not be an interactive site so much as a text guide for finding your own puzzle pieces.
Can you give an example of the kind of thing you use this to record?
Everything that is now up on my blog comes directly from my hypomnemata.
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.