I'd put the bills up there. They started off really well and had a great chance to establish themselves with Brady out for the pats and then their oline decided to suck, trent edwards got concussed and that vanilla D wasn't nearly aggressive enough to carry that O.
The Cowboys had a tough injury to their QB and a horrible head coach who let his OC become Sean Payton part deux. It wasn't so much a collapse as it was a Wade Phillips run team.
I voted for the Jets, they started well and had that huge win over the titans and then they got ahead of themselves believing the all NY superbowl talk, got complacent, I guess in an attempt to save stuff for the playoffs?, and Brett Favre reverted to the beat up old man the giants played in the NFC CG