[KenProspero]

FWIW, here's what I do when I sit down at a table (small stakes)

First, every time someone shows their cards, you have information as to what they'll call pre-flop, raise, call raises, etc. It doesn't take too many hands to categorize most of the table.

Second, who is driving the action (raising), who is just calling. If someone call a lot then raises -- watch out.

Finally, if you can't get the entire table, start by focusing on the players who have large stacks. They may be the better players (but then again they may be lucky fish). After that, pay attention to anyone you think did something REALLY stupid. Determine whether it was a one-off (might just be a bluff) or whether they live at the Aquarium.

Finally, anyone who doesn't stand out -- assume to be an ABC player.

Not perfect, but seems to work.