There are hairline scratches visible all over mine when I look at it from an angle with a light shining on it.
But they aren't visible normally.
We did not make these scratches. Apple did. They are there when you take your machine out of the box.
I also wish Apple would stop using acrylic. It's too easy to scratch. Adonized aluminum is the way to go, yes, for everything. My old 3rd-gen iPod scratched ALL the time no matter how much I protected it. It's back, it's front, the screen. My current iPod mini doesn't have a single scratch on it, not even on the screen. Albeit, I take a bit better care of it, but I've dropped it, slid it across hard surfaces. Adonized aluminum is much tougher than acrylic.
Come on, how would you like to have an aluminum iBook?
Also, the aluminum doesn't have to be silver. Apple could just colour an aluminum iBook white the same way they colour iPod minis.