i think this is obviously one of the hardest parts of online play. with limited info, it is hard to distinguish which players are strong, agressive players, and which ones are complete fish.
definitely invest in a program like pokertracker or pokeroffice, and study your stats.
in regard to specific players, i would assume that if someone keeps showing you the nuts, then your notes on that player would change accordingly. trying to piece together their thought process afterwards is probably a pretty try to piece together their thought process after the fact, when you have al of the information about the hand.
and of course, be critical of your own play as well. do you tend to play too many hands with this player, because you labelled him as a fish?
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