Gutenberg: Nevermore

I looked up "The Raven" by Edgar Allen Poe on Project Gutenberg. I do find this site to be a mixed blessing, although mostly a blessing. If PGCMLS does not have a title (or in most cases, it is a Classic that is not available and the customer needs it ASAP) and it is available here, than I am always eager to recommend this. However, the idea that books are being read online does not always sit well with me. Sure, I like my PC (and Mac) as much as the next person, but how harmful is it to read a whole book online. And if you printed it up for reading, how wasteful is that in terms of paper. Like I said, a mixed blessing.