According to this news item:
http://www.theglobeandmail.com/news/...rticle1420232/
Canadian publishers are dumbfounded by new airport security measures that seem to forbid passengers from bringing books and magazines purchased pre-flight onto airplanes bound for the U.S.
But laptops are on the list of acceptable items. So..... that would seem to mean you could bring an ebook, but not a pre-purchased paper book.
A very muted 'yippee'.
-Dave