great thread massimo.

i just had a thought about two barrels, even though you sorta said it already. (btw hope you don't mind other ppl posting comments like this in ur blog. just say if you do.)

it's when i see someone call my cbet with like A2 or A3 on a J 4 2 board. these are especially good targets to keep betting at given the boards you described.
the exception are complete calling stations. it's important to learn the first time if someone is a true station and not really bluff them (ideally from observation instead of spending ur own $$).
i add a note to ppl that do this that says something like "call cbet v weak" and ideally a note "tight for big pot" or something is there too. they often have 30/10 or so stats, but can even have tag like stats.