Very interesting article about (pseudo) price discrimination being used by the NHL to stem some serious strategy decay. I strongly suspect we're gonna start seeing such strategies used by web 2.0 players in the very near future.
No, I don't mean Amazon style geographic/profile-based price discrimination, I mean psuedo price discrimination based on imposing an artificial supply constraint, letting the equilibrium price move up the demand curve - just like in this example, which is why I strongly recommend you read it.