Mr Migraine himself has been traded to the Seattle Seahawks for a first a third and a seventh round pick. Not exactly Hershel Walker compensation, but not a bad haul for a player who in the best traditions of Viking receivers "plays when he wants". Definitely one of the most talented players in the league, but between the amount of games he missed to do migraines and injuries, and the games where he played hurt or ill, the Seahawks are taking a big risk by giving up that much and signing him to a long term contract.
The behind the scenes reality is that Harvin had run ins with both Childress and Fraser. While plenty of players had problems with Brad Childress, Leslie Fraser is known as a players coach who is very round around the edges. I see a bit of Stephan Marbury in Harvin. A player who simply didn't like the fact that with Adrian Peterson on the team, he was never going to be the "first option". He was demanding Calvin Johnson money or a trade, while rehabbing a sprained ankle away from his team (and trainers) in Florida... an injury that many didn't believe was actually season ending. One year he missed a majority of training camp for what was first supposedly a "family matter" that turned into a "migraine issue"... when the reality was that he was actually quite a headache over all. There were even rumors that he was threatening to "hold out" this year if he didn't get what he wanted. With little or no leverage, it's impressive what the Vikings got in return.
Perhaps Pete Carrol will be able to coax a 16 game effort out of Harvin and if so, Seattle looks to be a favorite in the NFC. For the Vikings, they free up salary cap space and are said to be going after one or more of the top wide receivers on the market, including Greg Jennings from division rival GB Packers. They also have two first round draft choices and with one of the youngest rosters in the league are looking to build on last years playoff season. Not to read too much into things, but the Vikings went 5-2 after Harvin went down, beating both Houston (on the road) and Green Bay during that stretch.