Another player archetype: The Game Breaker. The one who picks at the edges of the rules and tries to find ways to get outside the system. Even if it's not a conscious effort, there's a mentality of "I want to do this awesome thing so it should be possible even if the rules would normally prevent it". Sometimes veers into the anti-Rules Lawyer, giving too much priority to rule-of-cool over rules-as-written/intended.
Possible topics: "Breaking in" to the Weave--the first-game experience as a player or GM; what makes a good IC post (again, as a player/GM).