The battery seems to take up more than half the footprint (perhaps even volume) of the bottom portion of the machine.

Since I had no desire for this type of machine, I'll agree it's cool to see something so thin, but it doesn't do anything for me even after seeing it. I used to know a number of people that wanted a smaller Mac, but that extended to all dimensions, not just thickness. I am sure this machine will be a hit, but I think something with a 12" or even 10" screen would also have been.

Taking just 2" off the width and about 1" off the depth would have been a huge (positive) deal on this design.

I'm most eager to see what changes come with the next MacBook Pro revisions since I'd like to pick up a new notebook later in the summer.