I hated the idea of an e-reader at first, but changed my mind when I got a Kindle as a gift from my parents. I like it because I can load lots of books on it when I travel on a long trip. Sure beats carrying 5 books on a 2 week vacation.
I also like that I can download a sample of any book first to see if I like it, and the immediacy of being able to download any book RIGHT NOW with no wait is really great. Amazon runs a daily Kindle deal with a really cheap book, sometimes only 99 cents. I've bought quite a few of those, and almost all the classics (Count of Monte Christo, Little Women, that kind of stuff) are free.
That being said, I still buy some real books, especially art books. Those just aren't the same on an e-reader.