" Chaotic Good, "Rebel": A chaotic good character acts as his conscience directs him with little regard for what others expect of him. He makes his own way, but he's kind and benevolent. He believes in goodness and right, but has little use for laws and regulations. He hates it when people try to intimidate others and tell them what to do. He follows his own moral compass, which, though good, may not agree with that of society. Sovliss, a Ranger who waylays the evil baron's tax collectors is chaotic good.
Chaotic good is the best alignment you can be because it combines a good heart with a free spirit.

Chaotic Neutral, "Free Spirit": A chaotic neutral character follows his whims. He is an individualist first and last. He values his own liberty, but doesn't strive to protect others' freedom. He avoids authority, resents restrictions, and challenges traditions. The chaotic neutral character does not intentionally disrupt organisations as part of a campaign of anarchy. To do so he would have to be motivated either by good (and a desire to liberate others) or evil (and a desire to make those different from himself suffer). Devis, a bard who wanders the land living by his wits, is chaotic neutral.
The common phrase for Chotic neutral is "true neutral".
Remember that the chaotic neutral charachter may be unpredictable, but his behavior is not totally random. He is not as likely to jump off a bridge as to cross it.
Chaotic neutral is the best alignment you can be because itrepresents true freedom both from society's restrictions and from a do-goooder's zeal.

Chaotic Evil, "Destroyer": A chaotic evil character does whatever his greed, hatred, and lust for destruction drive him to do. He is hot tempered, vicious, arbitrarily violent, and unpredictable. If simply out for whatever he can get, he is ruthless and brutal. If he is committed to the spread of evil and chaos, he is even worse. Thankfully, his plans are haphazard, and any group he joins or forms are poorly organised. Typically, chaotic evil people can only be made to work together by force, and their leader lasts only as long as it takes to topple or assassinate him. The demented scorcerer pursuing mad schemes of of vengeance and havoc is chaotic evil.
Chaortic evil is sometimes called "demonic" because demons are the epitome of chaotic evil.
Chaotic evil is the most dangerous alignment because it represents the destruction not only of beauty and life but of the order on which beauty and life depend."

~ from the Official D&D Core Rulebook, Third Edition.

~ Jande