177. Print your monsters out ahead of time and remove their names from the paper. That way The players cant guess what you're using based on the region of the books you're in.
178. Practice your accents. Accents while speaking make NPCs more memorable, or at least more entertaining. Dont be afraid to sound funny, especially when roleplaying kobolds.
179. Cell phones off during the game. Nothing ruins your slow, dramatic buildup [through the creepy-as-hell ancient, haunted giant castle to the finale, where the titan ghast, desperate and screaming, attacks for the first food its seen since it was trapped here] like having a cheesy version of wagner's Ride of the Valkyries suddenly start playing out of nowhere. (I actually shouted in rage over this.)