[BotOnTilt]

There was some very good posts on the subject in a well, I think it was Aba20

Personally I have been a bit lazy with notetaking lately, mainly due to the fact that I've been bonuswhoring and I don't intend to play on one site for more than 5k hands, so the only notes I make are like "fishy" for players who play for stacks with crap, "bets heavily with set" "pushed nuts" and "bluffs".

Back when I played NL5 and NL10 I also made a lot of notes on tendencies of players, like c-bets 1/2 pot when missed flop, pots when hit. Those where worth a ton, but they mean that I need to pay a lot of attention to the games even when I'm not playing.