The Long Beach shooting was discussed in this thread, probably a page or so up. Long story short, a guy fled in a car and nicked a cop. Johnny was understandably pissed, shot him or the car to bring it to a stop, surrounded it, then shot the driver up like Sonny on the causeway. It happened when there were a ton of people watching, some of whom filmed it, which further angered the cops.
The Fullerton situation was a homeless guy who was suspected of breaking into cars. 6 cops gave him the Rodney King treatment, and tazered him 6 or so times. He went into a coma and they pulled the plug on him a few days later. Two people videotaped the scene, but the beating itself wasn't visible in either of them. The audio is clear on both of them and pretty damned disturbing. That's actually why I didn't post the youtube links, but they're easily findable. One of the videos is a guy getting clocked by one of the cops for filming the scene (although he was close enough to warrant it, IMO). The other is a group of people watching from 50' or so away. You hear the guy begging them to stop and crying for his dad and a lot of tazer clicking. Pretty damned depressing, honestly.
The Fullerton incident actually happened July 5. The cops haven't really done anything about it, but because of the publicity from the vids, they're now finally catching some heat. There actually is video of the entire incident from a security cam, but they're refusing to release it. The FBI is now investigating it as a civil rights violation.