Why is everyone so worked up over the seams? ... at least it adds a little design character. While everyone will sport the phone nude for the first couple of months, after the hype is over, the seams will inevitably be covered with an overpriced case for nothing more than the utilitarian purpose of keeping the phone in one piece after it hits the pavement.
Based on the Gizmodo breakdown, the seams are a solid integration in the outer bezel, which eliminates the possibility for dust/water penetration.
I doubt that the seam would really improve shock resistance. The most plausible explanation that I've read is that the seam is a vent and allows some of the heat to dissipate.
The iPad has some heavily discussed issues concerning heat-related shutdowns.
Based on the Gizmodo breakdown, the seams are a solid integration in the outer bezel, which eliminates the possibility for dust/water penetration.