I actually prefer ebooks for the books I go back to again and again. No such thing as a dog eared, falling apart ebook. No losing my notes either.
I was having a discussion with a good friend the other day--a few months back I convinced him to buy a Kindle, and even though he loves it, he still pictures his ideal library as a room full of shelves of thousands of big hardcovers. I told him my ideal library was four Kindles--one for the bathroom, one for the bedroom, one for the family room, and one for my bag. With that setup I'd almost always have my entire library, all my notes, and all of my bookmarks within arms reach.
But a lot of it comes from me being a guy who doesn't like to own a lot of stuff.