I don't want to say the game was rigged (although I did several times last night

), but I don't remember a bad call going Seattle's way, while I remember several going the Steelers' way:
The phantom offensive pass interference call at the beginning of the game.
The holding call that called back the touchdown (and had Madden and Michaels confused as hell as to how it was called).
The Roethlisberger touchdown (inconclusive, and I know why it was not overturned, but at full speed you have to be completely incompetant to call that a touchdown if you are the line judge).
The "blocking below the waist call on Hasselback after the interception (apparently the guy with the ball counts as a blocker who cannot be tackled now). This was probably the most blatent one, as well as the most important one as it led directly to the trick-play TD which put the game out of reach.
There are four critical calls that affected the game.
Seattle did make more mistakes then Pittsburgh, and the Steelers did capitalize while Seattle didn't, so I think Pittsburgh did deserve to win in that way. However, Seattle did a much better overall job on both sides of the ball that those bad calls were absolutely critical to the outcome of the game.