I have one of those Kindle things, and it is fun and intriguing--you can store hundreds of books in there, so it's nice for long flights and international travel. It also has a dictionary--very handy when your reading a book by, say, John Banfield (who's a brilliant author, but has the most amazing vocabulary).
But, but, but, I have to say--absolutely nothing replaces real books in my world, and if you saw where I live--bookcases by the mile! I once tried to figure out in strictly material terms what my possessions would amount to--and came up with about 80% paper (that would include letters, cards, photos as well)! Whereas clothes, dishes, ornaments, etc--a mere 20%. I'll probably have to come back as a tree in my next lifetime!