one episode on why graphics cards can only passively support up to 2 monitors without having "Active" display adapters.
One episode on Active vs passive display adapters.
One episode on MST hubs and multi monitor set ups, how they work, why you would/could use them, and what requirements you would need to push X-amount of monitors.
in one of them you could also touch on if it's best to have all monitors the exact same make, model, and resolution, or having a hodge podge of random monitors, the good, bad and ugly of doing more than 2 monitors.