On Defense, I have to say that Linvall Joseph is my pick. He really has been terrific this year. He is really becoming one of the better DTs in the NFC, and I think once he gets some more experience, he will become a top DT in the NFC.
On Offense, I really think Kevin Booth has done some great work against talented interior linemen and has helped clear the way for three dominating rushing performances this year. The whole O-Line has been terrific, but to me Booth has really been one of the key guys.
I'd be interested to hear some other opinions as well.