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.