The Kindle commercials simply don't address the real issues:
if it slips out of my hands and drops down on the pavement, can I still read the book afterwards?
or
if I take it down on the beach and it gets covered by sand, drops of saltwater and sun lotion, can I still read the book?
or
can I whack the groper on the train with the Kindle and enjoy the book afterwards?
Seriously, do people wonder if they can mark a page by folding it down? Why not point out real advantanges over a book, e.g., that you can always have a large selection of books with you?