Quote Originally Posted by dsaxton
It obviously depends on the player, but I think there are some patterns that you can expect from a random opponent. Check-raising a huge flop bet after calling a preflop raise is a pretty obvious sign. Check-calling on a rainbow flop, then check-raising when no apparent straight card comes. Betting, then reraising a raise from a preflop raiser (this is somewhat less common, since most players at lower and middle limits slow-play sets almost habitually). Pretty much any line of betting that involves slow-playing by a player who limped in, then called a raise preflop indicates a set.

My personal favorite way of playing a set is betting, calling a raise, and then check-raising on the turn. It's nearly impossible for the other player to put you on a set until the pot is already huge (at which point the opponent may start to feel committed to the hand), and he's almost obligated to bet big on the turn since in general you could have easily been semi-bluffing with a draw on the flop.
What do you do when the guy flat calls your flop bet though? Do you still check raise him on the turn, or lead out?