For as easily as teams can rise from the dead in the NFL, I'm not sure the Skins are one of them. If you look at most of the new contenders who were recently dreck, they all have new, younger coaches: The Lions, The Bucs, The Jets, The Niners, The Pack etc are all led by coaches who are coaching their first teams and are hungry- and their understand the modern NFL better than the previous generation. I'm just not sure Shanny's the guy. Plus they'll probably be breaking in a new QB. So much of this answer depends on the 2012 draft, but as of now, I see 7-9.
For Philly- It's hard to know cuz who knows what gonna happen with Reid. And..do they resign DeSean? Do they get better LBs and O Linemen? They've got great pieces, depends on the supporting cast. 9-7 at least.
I think the Cowboys get better, with Garrett's system and some new talent on the D side helping make them a contender. 10-6 atleast and a play-off run .
Giants. It's so hard to figure this team out. If the Giants miss the playoffs it might be over for Tommy C. If Bradshaw remains healthy, this still remains a good team. But do Osi and Tuck start to slow down soon? The secondary is weak. I'm saying 8-8/maybe 9-7.