I'm going down the list of possible destinations for Brett Favre, and the Redskins are starting to look more and more like the most likely destination. Right away, you can eliminate Chicago and Minnesota, because Green Bay still controls his rights and there is zero chance they deal him within the devision. Miami has frequently been mentioned, but I can't see Favre renegotiating his contract to play on a team coming off of 1-15. Likewise Atlanta. Baltimore is a possibility, but the Ravens are focused on rebuilding and are downplaying their interest. The Jets are a logical destination, although they haven't been mentioned as prominently as the other teams and should be concerned about retarding the development of Kellen Clemens by potentially moving him to third on the depth chart. Tampa Bay is a strong contender, since Jon Gruden is a former Packers assistant coach and he loves to accumulate quarterbacks.
Mike Francesca today indicated he had heard Washington and Carolina were in the mix. Out of all of these teams, the Panthers are the only one with an above average quarterback, as Jake Delhomme was on his way to a career season last year before he hurt his elbow, and is expected to be back at 100% (or more) next year. Also, the Panthers have already traded their first round pick for next year, so they may be wary or trading another high pick. That leaves the Redskins. They don't seem to have the cap room, although that's never stopped them before. It may hurt the development of Jason Campbell but, again, that's never stopped them before.
Looking at the obvious problems with acquiring a starting quarterback for a single season (building cohesion with the receivers and offensive line, learning the playbook, fracturing the locker room), the two most likely outcomes for the Favre saga are Favre starting for the Packers in week one or staying retired. But since I didn't see the retirement story getting this far, I'll acknowledge Tampa Bay, Washington, and the Jets as the likely contenders.