I have a lot of non-IT stuff that I'd like to know at one time - so, in a spirit of sharing our TOKNOW lists, my current one:

    - Economics
      - Micro
      - Macro
      - "Applied" - stock markets, credits, all that stuff - how it works, etc. (I know almost nothing about it)
    - Knowledge about societies - how they form, how they function, etc.
    - Bayesian probability (working on it right now, thanks to AI Class), set theory, maybe category theory
    - Control theory (I do really, really regret I didn't care about this at university)
    - Biology
      - Genetics 101 & blood groups (I forgot all this stuff since high school)
      - Nutrition 101
    - First aid
    - Pretty much whole physics (Feynman's lectures sitting on my bookshelf and waiting ;))
    - History
      - of civilization, especially Roman history
      - of science, technology and enterpreneurship
      - of modern geopolitical structures
    - Geography
      - World energy infrastructure
      - How many resources do we have, where they are, how fast we use them
      - How the world trade works
    - Literature
      - "Homeless People"
      - "Crime and Punishment"
      - ... and then some other good books

And that's really just (non-IT) knowledge; there are also some skills I'd like to acquire that are not listed. I know some (most?) of that stuff was covered in high school, however I somehow missed it all then (I didn't care / school wasn't really helpful to make me care). This list reflects some topics I spend time thinking about / worrying about, but at some point I realized I should either sit down and learn some of it, or stop caring that much about things I don't understand.

From the technical side (which is actually the main topic ;)), I keep all of this in plain text; it used to be .txt files somewhere on my hard drive, now it's in Org Mode.