Just a quick look here at the Seattle Seahawks' 2011 opponents, based on information provided by the NFL.
Those who pay particularly close attention to scheduling rotations might detect some irregularities. The rotation is not always consistent in the way home-and-home games are rotated from one year to the next. The current rotation starts anew, in other words; it isn't really a continuation of what came before.
The final row of the chart shows opponents based on how teams finish in the previous season's standings. NFC West teams are paired with NFC East and NFC North teams this season, meaning the NFC West champion Cardinals face the NFC East champs (Dallas Cowboys) and NFC North champs (Minnesota Vikings).