[OrianasDaad]

I often take notes on paper, since I use pen and paper for my offline study of individual opponents. When I'm putting notes into a box while playing, typically it's something that indicates clearly a players style or tendancies. Calls down with any part of the board. Blind steal with garbage against a player who hasn't layed down his big blind - ever. I've got my own shorthand for this, but it's so convoluted that it wouldn't make any sense to most players.

Bison's "notes on notes" is really an excellent post.

I'll be detailing what I do eventually put into notes in a post later today, probably in the small stakes forum. I've found this method, while it takes much longer than jotting down some notes develops MUCH better reads on opponents tendancies, and will make you a better player over the long run.