Vikings owner wouldn't want Favre
"I would have been interested 15 years ago," Wilf said. "I'm not interested. He's a great guy. I'm just happy that we don't have to keep on facing him."
Source: Minneapolis Star-Tribune

Favre wanted to 'stick it to' Packers GM
Favre believes Thompson wanted him to walk away, so the Packers could begin the Aaron Rodgers era. And he's right. Favre also admits that a strained shoulder and torn biceps muscle kept him from throwing the ball down the field in last five games of the season. "I was miserable that last month," he said. "I altered the way I threw, and it cost me. I just couldn't throw it well enough."
Source: SI.com

Favre insists he won't be coming back
Favre said he understands why people might not believe this is really the end and admits he could get the itch again when training camp nears.
Source: ESPN.com

King: Favre likely retiring for good
King cites Favre's injured right biceps and his current comfort zone as reasons for staying retired. He did, however, hint that Favre would consider joining his former mentor Darrell Bevell in Minnesota if his agent could "engineer" the move.
Source: SI.com

Favre's biceps main reason for retirement?
"It is, it is," he answered said when asked if this is truly the end. Favre was also surprised by skepticism that his decision is final. "Physically, if I felt better we might not be having this conversation," he added, implying that his body couldn't hold up. "That's the writing on the wall." Favre added that he never asked the Jets for his release to go to the Vikings.
Source: Unknown