E-books are nice! The are convenient. The only thing I don't like is that you can't keep them. When you buy a book - it's yours. When you buy an e-book, you usually only have it for 3-6 months. I like to refer back to books.
E-books make it so that you don't have to lug around a suitcase to class. However, like johnnyarei mentions, they are not yours to keep. I might use some of these for books I won't want to refer to later...we'll see.