well, seeing as noone has posted here yet, I figured I would step forward and give it a try. I have moderated forums, game servers, and clans. Usually they have a relatively small base though, when compared to anandtech.
To me, a good moderator is someone who keeps their cool, is as unbiased as possible, and flexes their power when necessary, not because they feel like it. They uphold the rules, and are by the book in the sense that they follow the procedures, rules, and protocol of their community (whether it be a game, forum, or clan/guild.) They keep rowdy members in line, but they do not overstep their authority, and respect the rules which they enforce.
Also, a moderator is a sort of leader. They encourage people to communicate intelligently and civilly, to think critically, and act as a role model for good behavior. When someone strays from the rules, they are there to set them back on the path.
But why would someone want to be a moderator? Some people are natural leaders, and are good at helping and teaching others. I try to be this way. Furthermore, good moderators are what I call "servant leaders." They step up not because they want a shiny title or power to boss people around, but because they want to help others; they want to serve.
In my gaming organization, with about 1300 members, this is very important for our officers. They are integral to the clan, they manage funds and game servers, they enforce rules, and they help others, whether it be in training for skill, or to make them into future leaders. They can help with technical problems, solve problems between members, and they can make the environment more fun for others.
On anandtech, we have thousands of readers and posters. There are many people with many different personalities, and we are expected to more or less get along. A moderator prevents drama, solves conflicts, removes hurtful or inappropriate posts, and helps others get along.
As a moderator, my job, in short, would be to help others, and enforce our rules. Though I do not know as much about SSD's and HDD's as some people, I know a fair amount about the subject matter, I have my A+ cert, and I am willing to help contribute and moderate how I can.
-Shmee