How does one become a mod you ask?
Dedication to the forums. Helping others with Linux. And Jeremy's picking of you. Well, now with a large group of mods, he asks our opinions when a mod position comes available or is needed. In most cases now, he picks who we as in the current mods feel would be a suitable moderator.
So be nice to the mods, help out by answering questions, report posts that break the rules and so on. And don't have 95% of your posts in General and you to may become a moderator here..
But it will always be Jeremy's call who becomes mod in the end.