I'd like to see the Pack and the Colts, and it might even happen. The wild card teams can safely be written off; the Vikings, Jets, and Broncos will certainly be gone after week 1, and I think the Rams will join them (2/3 of the time teams will get that 3rd win over a team they've defeated twice before, but no 8-8 team has ever won, and I still like the Seahawks here). But I suspect any of the division champs except the Seahawks have a decent chance.
There's no team in the NFC without gaping holes, mostly on defense. The Eagles have been awful while resting their stars for the playoffs and without TO; I don't know if they can turn things up a notch in the playoffs. It's impossilbe to have much confidence in Atlanta; they depend too much on a fragile Mike Vick, who just isn't a good passer. Seattle should have rolled through the season and into the playoffs, but stumbled to 9-7 instead, and they have injury issues now. The Vikes have already proven they can't win a shootout with the Packers. And the Pack have to get into shootouts, because they can't stop anybody.
In the AFC, the Steelers have a rookie quarterback, the Pats have been winning ugly, the Chargers have no pass D, and the Colts have no D at all. Still, they're giant steps ahead of the Jets and Broncos. And this is an offensive year.