We know that the Steelers will be sitting some starters. We know that the Cowboys, Giants and Texans are also locked into their playoff seeds. And that's about all we know heading into Week 17.It's a tough time to play fantasy football, which is why the majority of season-long outfits finish up in Week 16.But plenty of folks are still playing on, so we're previewing the final weekend of the regular season.What are the other QB situations that could affect fantasy values at various positions in your lineup? What are the most significant injury situations to watch -- or even some quieter spots that could prove key?We're running through position by position to help you get set for the NFL finale.