Poker Tells 
Poker lessons
Watch the Eyes
The eyes rarely lie – hence you often see people playing with sunglasses. Some players can't help but stare at big hole cards, so their length of time peeking is longer.
If a player is looking to steal the pot, he may look to his left to see if the remaining players, who haven't yet acted, have quickly glanced at their cards and are likely to fold.
A player might also try to ask you questions about your hand, knowing that people rarely can "look someone straight in the eyes" while being dishonest.
Facial Expression
Some people will often show nervousness in their face or even for repetitive characteristics like a body "tic". You may have obvious unhappiness in your face when your hand is weak, and conversely, you may show a contrasting show of confidence when your hand is strong.
Weak is Strong/Strong is Weak (also online)
In its most basic form, this usually applies to novice players but frequently applies to advanced ones as well. Basically, players like to be actors, and when they have a great hand they tend to look disinterested. Alternatively, a player increasing the level of his voice while raising the pot, and trying to look intimidating may be running a pure bluff.
Sometimes online players will chat while playing a hand. Their chat can sometimes give away a tell.
Anxiety
Anxiety typically occurs in people when they are confronted or anticipating confrontation. Physical changes happen including flexing of muscles, eye pupil dilation, palpitating heart rate. In poker, when someone has a big hand they are typically ready for confrontation and can exhibit some of these characteristics. You may see the chest expanding abnormally or you may notice the players voice become slightly higher as he makes a comment. Some of the top players in the game will stare at the vein on the top-side of your face for blood pressure changes. During a bluff, the player may demonstrate anxiety, but if he knows he will fold the hand if re-raised (non-confrontational end) may look quite comfortable.
Trembling Hands
Beware of a player whose hands are shaking, this nervousness can represent a big hand. Also look for visible increased adrenaline/blod-flow.
Glance at Chips
Again, relating to the eyes. It is common for players to quickly glance at their chips if they get a good flop or later street card. This may be a subconscious reaction, but the player is already planning his attack.
Peeking Hole Cards on Flop
Some players will take another look at their hole cards when the board is showing a potential 3 card flush draw. Typically, the player is looking to see if one of his cards is connecting, because he only remembers that his two cards are of different suits.
Repetitive Betting Patterns (also online)
Usually the most revealing tells are based on the way a player habitually bets during particular situations. Maybe a player always checks when he has made the nuts or a player may regularly fold after being re-raised. This is one of the tells that actually can be very profitable in online games.
Body Posture/Attitude
Some players show obvious changes in their posture based on their attitude/hand strength.
For instance, you may notice their shoulders drop/slump when they are not confident (weak hand).
Conversely, you may notice the player is very attentive and sitting in an erect position when hehas strength.
Chip Stacking
When you first sit down at a table, study the way the players stack their chips. Although it is a generalization, loose aggressive players typically maintain unorganized/sloppy stacks, while tight conservative players keep well organized/neat stacks.
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