With regard to the "how could the refs be biased against the Steelers three weeks ago and then for them last night", were I a conspiracy theorist, I would argue that three weeks ago the Colts were the story of the year for the NFL (big regular season, Dungy death) and so the NFL did want to see them go to the SB. Unfortunately not even the refs could overcome the vortex of choke emitted by Peyton and Dungy, so the Steelers moved on. When we wound up with a Steelers vs. Seawho? SuperBowl, the STOY shifted to Pittsburgh since the Seawhats? had nothing going for them from a hype standpoint. That's why there was a shift in bias, if you believe that. I don't, particularly, but that's how I'd argue it.
For the most part I don't believe there are HUGE conspiracies in the NFL like Vern toyed around with, but I think there are some here and there. The biggest one that sticks out in my mind was the 1999 NFC title game between the Rams and Bucs where a Shaun King to Bert Emanuel pass that would have been a first down with good posiiton to score was reversed by the booth (inside two minutes left), because the NFL was saying "There's no way in hell we're letting Tampa go to the SB over the STOY Rams"