Hi Adam,
You asked for topics, here is one for you to consider.
Categorizing players is an art. It comes from experience, it comes from advice, and it comes from the better players. You have the experience, give advice, and are a better player, so there is a lot we can learn from what you have to say about identifying players by their playing behaviours.
I would suggest your article be given in three parts: (1) Categorizing players: Beginners, (2) Categorizing players: Good players, and (3) Categorizing players: Advanced ideas.
This means you can break the work down (we do not want to run Adam into the ground writing articles ...) and get some "good practical advice" on identifying players.
Then you can write the article; "What to do once you have categorized your players" since there are a lot of players that correctly identify they are at a loose, passive table, yet play the table straight forward.