I have always used various bits of notation to simplify note taking, including

• ∀= for all
• ∃ = there exists
• ! = NOT
• Σ = Sum of

and then brackets as well. Mostly I use these notations for taking notes during meetings.

I am a list fanatic. I write lists of everything in order to remember them. Unfortunately, when I have written down the list, I then forget the items on it, so I am really in trouble when I lose the list.

For less structured note taking, I always use Mindmaps. Paper versions are great for taking notes and there is a program which is also great and can output HTML.
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Brovnik.