I think I might be the one person in the world who absolutely despises physical books. I read precisely 5 books from ages 0-19 of my own volition in the pre computer age. Personally my eyes are screwed up and I have trouble reading black text on white background. Also the way books are designed is a PITA to hold comfortably, especially if your trying to lay down and read. Since I started using Dingo/Caanoo Ive read 16 books of my own volition(since mid 2009). So for me.. its digital format or nothing.
Also being a student i 1000 times prefer a digital copy to a regular book. With a regular book you have to sit and read long passages or the whole text to find one reference. Whereas with digital copies having the keyword find feature in both word and PDF what would take hours takes seconds. Digital all the way.
EDIT: for those who need filler material for a lacking digital library I humbly link
http://www.gutenberg.org/wiki/Main_Page for all your free reading.