I've got a nice eBook reader which I bought for reading the sort of scholarly articles I can get from the ACM digital library, and other web sources.
I still find myself using printed copies purely because I can *much* more easily flip between pages, and can organise the pages on the desk the way I like as I try to follow the argument (and a self printed copy is better than a bound copy here, because the binding restricts the layouts).
I use a ebook reader/printed copies rather than the screen to give my eyes a rest, and a change. The point is that a single format is not the best for every use, so I think the death of the printed book is overhyped and it will just become another media format (and probably a niche one). But books do have some major advantages over the other formats. They don't require any support technology to read, they are stable for a long time , are not as fragile as an ebook screen, and they are cheaper than an ebook reader. All of which may be important to your needs.
Novels, I prefer in ePub/Mobi formats since the reader I have is has a form factor which allows it to fit into a pocket better than the massmarket paperback format. And this is depsite having a screen approximately equal to the pages size, the ebooks thinner form factor work better given the way most pockets are constructed.