I like the idea of keeping a personal library of all the books I've loved and scribbled all over. And I'm becoming more of a luddite every year. And there's reasons I can't really put into words that are probably irrational. Is there an e-reader equivalent of drawing smiley faces in the margins? How much do online books cost? I refuse to investigate these things because I fear change.
I could see myself falling in love with an e-reader if I bought one though. Having a dictionary installed sounds really great for harder authors and foreign languages.