The Pats D just never let's the opposing team get out of the gates. They are also very well coached and are masters at disguising their defensive coverage. No quarterback looks good against that D - you simply cannot figure out the coverage scheme even when the play is underway. Rodney Harrison made that first interception and was a good 20 yards from the ball when it was thrown. There was a lot of air under the ball, but he still came from nowhere to pick it off.
I wonder if there was wind in the stadium? McNabb was even having trouble with the shorter balls.