I think something being left out is the "gotta get back that lost money" state of mind.

I think this is definite form of tilt and one of the worst.

Scenario: You're playing awesome, you're dealt AA and you push it pf with some fish who has 47o and he rivers the straight. You're down $50. 70 hands later and a few more suckouts and you're down $200. The worst thing to do is think "I'm down $200, I need to make that back". I'm a huge tilter in this fashion and to me it's honestly one of the most dangerous forms. You begin to chase flushes more often because "it can potentially win you the hand and get you your money back". You begin to start doing all sorts of things you wouldn't normally do. Like Dwarfy said, don't think about past hands. I would just like to emphasize, don't think about your bankroll (in negative terms meaning don't let it make you nervous or agitate; of course you need BR management and a loss limit, 10% I'd suggest, to know when to end a bad night) or what your net gain for the night is. It will only hurt you. One hand at a time, play in the moment.

edit: I also forgot to mention that if you're tilted come to IRC and talk to the guys. We're sometimes funny and can lighten your mood. Typing things like !kick dwarfman also helps.