In all my leagues we use week 16 as our SB week, then use week 17 as sort of a "rivalry" week, which we include into the overall standings but have no playoff bearing. I (the commish) try to pit the guys who are most bitter towards each other against one another, then we lay odds on the games based on matchups, throw some money into a jar on each individual game from each owner, and the game winners (and spread coverers) take home the bacon. It's a fun, neat idea that is better suited for local leagues where all10-12-14 etc....members are accesible.
And by the way, I started Ron Dayne today.