I found it difficult myself taking notes so I came up with a system to assist. Call it shorthand. Some players have found it useful. I find it very useful because in 1 second I can tell what kind of player he is instead of trying to remember that LP-P, LP-A, LA-P, TA-A and the other 20 abbreviations are.
http://www.texasholdempoker-stats.com/thp_ratings.html