Agreed on textbook/student note taking angle. But I really think you're in the minority as far as not minding touchtyping on a glass screen — I think that would get old fast for writing anything longer than a paragraph.
I'm eager to see how this works as an eReader. I still think that reading a book on a backlit display sort of stinks. I'm wondering if people will spring for the iPad as an eBook reader because it has so much else to offer, and then realize a few days later that they just can't ignore the eye strain.