I personally am a big Chicago Bears fan, so including this in my list kills me but as a sports fan, I cannot leave the Packers out from my list.
The Packers won a spot in the playoffs by winning an NFC Wild Card spot. With all their injuries no one thought the Packers had a shot.
The Packers had lost members of their offensive line, defense and their running back in Ryan Grant. There was no way they could win the Super Bowl.
They proved me wrong. They proved everyone wrong.
They stormed through the playoffs beating everyone on the road to eventually earn themselves a spot in the Super Bowl against the Pittsburgh Steelers. They showed tenacity, unrelenting defense, their high powered offense, and Aaron Rodgers had his coming out party. Who's Brett Favre?
All this team has done since their Super Bowl victory is win. No one has stood in their way and I don't really see anyone standing in their way (until the Bears on Christmas Day, hopefully).