I actually recommend Vincent Bugliosi's book on the case, Outrage. Bugliosi is the guy who prosecuted the Charles Manson murders back in the 70s and as such knows a lot about how the justice system in LA works. He's also very bombastic and, shall we say, sure of himself, but that only makes for more entertaining reading. In a nutshell, what I've picked up from the case is that the prosecution did a monumentally horrible job presenting the case and Judge Ito allowed a crap-ton of things to go on that he shouldn't have. Lots of people like to toss out blame on the police, the defense attorneys, and the jury itself, but frankly the police did their job pretty well (not perfectly but things are rarely done perfectly), the defense just did what the defense is supposed to do, and if the juries accepted the veracity of an unstated conspiracy on the part of a racist cop and the entire police department to frame Simpson, a big part of why they may have accepted doubt is that the judge allowed crap like this to fester without it being stated explicitly and the prosecution did a piss-poor job of shooting this down.