Excellent question.
Great Idea Too!
After all Apple offers the MacBook & MacBook Pro. This falls in line with the same thinking. I love my new 15" MacBook Pro!
I have an iPhone 4 & Galaxy S. They have 3.5" & 4.0" displays respectively.*
I greatly prefer the 4" display and would love to have that on my iPhone. It only ads a few millimeters to the footprint, while the phone still remains less than ten mm thick.*
It's even lighter and ergonomically superior to the iPhone. Apple could use some tips from Samsung on how to build a thin, light and well made smartphone.*
Mine is the AT&T version (Captivate) which only uses a composite for the inner chassis. The rest of the phone is glass (front) and metal back. It's beautiful, far nicer than the pictures reveal.*
Size is ideal for such a large screen. It's Samsung's design expertise that reduces the overall size of the phone. The display is nearly edge to edge.*
This Android is fast, fun & reliable. I've had it since release day and it's been perfect.