The title says it all: the worst cases of police abuse in 2011, as documented on Youtube.
I really wish that incidents where a civilian is wrongfully killed by a police officer would be as vigorously prosecuted and punished by the courts as when the reverse happens. In theory, police are punished if they kill an innocent person. In practice ... I would say they tend to get away with it more often than not, or at least get a slap on the wrist.
This is especially true considering that a civilian shooting a police officer is pretty much a death sentence.