Everyone seems to interpret the alignment system differently, so I figured I might as well share my current views on the subject.
Lawful Good: Truth, justice, and/or a code of ethics is the best way to do good for people. Evildoers must answer for their crimes.
Neutral Good: I don’t have any particular method of doing so, but I do good in whatever way I can.
Chaotic Good: I will fight for personal rights and freedoms for all people. By any means necessary, I will rebel against those who would subjugate the people, and crush any evils.
Lawful neutral: There are some basic rules and/or laws which should never be broken, but aside from that you may do as you want. However, order must be maintained.
True Neutral: I care about myself and my loved ones. If I’m fighting, it’s either for them or my own gain.
Chaotic Neutral: My own freedom is the most important thing. Nobody can tell me what to do.
Lawful Evil: Order must be maintained by any means necessary. Those who would oppose the authority who maintains order must be crushed. There are still rules we must follow, but none of them come from an ethical basis.
Neutral Evil: I do evil when I get the chance, but I’m not going out of my way for it.
Chaotic Evil: I live solely for evil acts. Whatever my particular brand of evil is, nothing can stop me from spreading it.