The score really didn't quite indicate how well the Giants dominated the Chiefs. Cassel had two garbage time TD throws, and Larry Johnson did basically nothing against the Giants maligned defense. I'm honestly shocked at how well the Giants passing game has been going, even though they haven't really had a challenge so far.
I'll start off with what I'm concerned about. Obviously the biggest concern at this point is Eli Manning's ankle/foot. Such a strange way to get injured. It seems as though he'll be available for next week, and let's be honest, David Carr could probably beat the Raiders. He's certainly better than JaMarcus Russell. If Eli does play, they will most likely run the ball more, and perhaps put in Carr if they lead by enough at the half or end of the 3rd quarter.
One major thing I'm a bit concerned about is the upcoming schedule. The Giants have a bye week at week 10, but face (after the Raiders) the Saints, the Cardinals, the Eagles, and San Diego. Assuming they beat the Raiders, I would hope the Giants could win 3 of those 4 games reasonably. 2-2 in that stretch would be okay, landing them at 7-2 at the bye.
Going along with the schedule concern, these upcoming games will really test the Giants ability to defend the long ball. Drew Brees can clearly punish defenses with a deep ball, as can Warner, McNabb, and Rivers. The Giants also don't have the luxury of an early bye week where they can rest their injured players. And boy do they have an injured secondary. This could turn into the perfect storm in late October and November.
As for the good: the Giants are 4-0, with two division wins. A win against the Raiders would go a long way considering their upcoming schedule. A healthy Eli Manning means pressure off the running game, and the combination of Jacobs and Bradshaw has been stellar lately. They've both on pace to run for more than 1,000 yards this season, and Manning over 4,000 yards passing.
Their defensive line has done a great job of confusing offenses, and spreading the wealth around their expansive depth. They will HAVE to use this to their advantage against their ugly 4 game stretch. If they can heal their wounds and focus on the game ahead of them, I could realistically see them at 8-1 going into the bye week, though 7-2 wouldn't be the end of the world.