So, about... Chaotic Neutral.

The problem isn't in finding a good definition of CN, really. It's just chaos without the benevolence and malevolence associated with the CG and CE, respectively. The problem is in how you define "Chaotic" in the first place. I've said this before, somewhere, but there is no good, agreed upon gauge from Chaoticness, and even the Player's Handbook flip-flops and contradicts itself (effectively. they describe Chaotic is as being just like Lawful only, you know, not).

Here's what I do. Throw out all the crap about self-discipline, spontanaeity, and insanity -- it just confuses the issue and causes people to talk in circles -- and look at it concretely. Lawful people have strong inclinations to respect the Laws and traditions of whatever land they are in, Chaotic people have strong inclinations to defy the laws and traditions of wherever they are, and Neutral people don't care much either way. Chaotic Good people defy the law in order to help others, Chaotic Evil people defy the law in order help themselves (at others' expense), and Chaotic Neutral people defy the law because, well, they feel like it.

Chaotic Neutral is the alignment of smugglers, spies, dashing rogues, anarchists, petty (but harmless) theives, mercenaries, and other ne'er-do-wells, as well as a number of more respectable individuals that don't break the law often, but would if they had a reason to, and didn't fear arrest.

If a character routinely breaks the law to help others, that character is Chaotic Good. If a character routinely breaks the law to harm others, that character is Chaotic Evil. If a character routinely breaks the law, but helps and hurts others in equal measure, that character is probably Chaotic Neutral (or Chaotic Good and really bad at it).

For the record, stealing from those who can't afford it, killing people who don't deserve it, and fighting those who can't fight back are all Chaotic Evil actions, as is stealing everything not nailed down and and harrassing random peasants and then claiming you're allowed to because your Chaotic Neutral (the correct response being, "not anymore, you're not."). Oh how I hate it when people do that.