This is some of the best writing I have seen about this subject.

Glazer is right on the money when he points out how Favre has publicly called TT a liar, leaked supposedly private conversations between the two, and completely ignored the fact that TT has asked Brett twice for a list of teams he would accept a trade to.  Brett has not responded to either request.  Is that because the only team he wants to play for is the Vikings, and he knows the only way that is going to happen is if he gets released and that is NOT GOING TO HAPPEN.  As Peter King points out, Brett doesn't want to give a list of teams because he knows that a trade would happen and he would be forced to show that he really doesn't want to go anywhere else.  How can he expect to be welcomed back to the Packers after he has called his GM a liar and said he can't trust him, put Mike McCarthy in a terrible spot by putting the focus of the team on one guy who isn't even a member of the team, thrown his buddy James Campen under the bus, and when he hasn't participated in even ONE off-season activity of any kind.  How would that make the players on the team who HAVE worked their butts off this off-season feel if one guy (even if he is Brett Favre) just waltzes in and takes the job from the guy they have been supporting and working with all off-season?  Not even Mike Sherman would let Brett take Febuary to July off completely and Sherman was scared to death of Favre. 

Every person involved in this situation has handled it poorly, but Favre has now seemingly decided that the best way to get his way is to act in such a way that the team has no other choice but to release him, simply for insubordination.  Behaving the way that he has is surely not the best way to make yourself look appealing to any potential suitor.  If I was a team thinking about picking him up I would have to think long and hard about what he would do to my team if he didn't like something we did.  Especially if this is how he treats a team that he supposedly loves.