A few things I'm thinking about:
1.) The games against Chicago were close last year, and they are inarguably better this season. Rodgers ended the first game on a play-action TD to Jennings. In the second game the Pack won by a narrow margin even though Cutler threw a pair of ugly picks. Chicago doesn't appear to be the same team this year. Urlacher is healthy, Peppers absolutely improves their pass rush (a hearty LOL to the feller at the top of the page who claims Peppers is "no threat"), and the Martz-Cutler marriage seems legit.
2.) Cover 2 schemes can give Rodgers trouble. Granted, Rodgers lit up the Vikings secondary in the two games last year, but he was also sacked 13 times in those two games. Rodgers' worst game last year was against Tampa Bay -- another Cover 2 team. Last year there were only three games where Rodgers threw under 200 yards -- two came against Chicago. Cover 2 schemes employ a lot of four-man rushes, which are responsible for most of the sacks against the Pack. When a defense consistently drops 6 or 7 into coverage and still generates pressure, it's not hard to see why Rodgers can struggle.
I think the key for Green Bay is going to be in running the ball adequately. Jackson and Kuhn need to get their share of carries and yards, otherwise Chicago is going to pin their ears back and play coverage all day. I say again -- Rodgers threw less than 200 yards in both games last year. Add the fact that Chicago is better offensively and defensively (compared to their team last year) and tonight's game should be close.
Force Cutler to force throws. Get enough carries/yards in the run game to keep the defense honest (ala last year's play action TD). Don't turn the ball over. Don't let Chicago's special teams beat you.
William Henderson didn't have to run people over. His preferred method was levitation.
"I'm a reasonable man, get off my case."