I like hardbound books for the added durability, but as long as it's ink on paper, I'll read it.
I do read "E-books" once in a while, but if the e-book craze kills the printed book industry so help me...
I can understand wanting to save trees, but trees are a much more renewable resource than the electricity e-readers need to work, given that much of our electricity comes from fossil fuels.
Last time I checked, it was a hell of a lot easier (and quicker) to go plant a tree than it was to wait for more coal to form somewhere.
Personally, if we had the money to do it, we'd probably go 100% solar power.