I had hoped / feared that Pizza Guy (a.k.a. Matt Cohen) was going to be curious enough to finagle his way past the door and get drawn in somehow to the party events. But Tedd has managed to get rid of him -- for tonight. Aaarrrghhh!!! Now I'm going to be curious as to how the Cohen plot thread plays out -- but nothing is going to happen until the gang returns to school on Monday -- and who knows how long that will take in real time!!! It could be years before we see him again!!!
Somehow, I doubt that Sarah's scheme has any chance of succeeding. The "juiciness" of the gossip that Tedd is presumed to crossdress while having some other boys in his house arguing about skirts easily outweighs the leverage value of Matt being only 17 while delivering pizzas by car. And just how is Sarah so certain that Matt is only 17?
Besides, they cannot possibly even begin to implement leverage until they see Matt again on Monday. But what if, say, Matt figures out that Tedd was the person in the girl's uniform while he's driving back to the pizzeria, and when he gets there the jock Tony comes in to buy a pizza, and Matt tells Tony what he just saw. Sarah can blackmail Matt only if she knows that Matt has recognized Tedd but has not yet told anyone -- and even if it worked it would only prevent him from openly telling about Tedd. He could still start rumors if he does so anonymously (e.g. bathroom wall).
And on top of everything else, the leverage power entirely evaporates the day Matt turns 18.
All in all, despite her imitation of Mr. Burns, Sarah is not really cut out to be an evil scheme meister.
EDIT: Oops! I read Dan's post on the other forum (for those of us who didn't get it) that Sarah is making a joke, and knows full well that her "plan" is no plan.