Technical books must be on physical paper for me, especially when used as reference materials. Casual reading (sci-fi, fantasy, etc) I like to have on an ebook,

Technical books must be on physical paper for me, especially when used as reference materials. Casual reading (sci-fi, fantasy, etc) I like to have on an ebook, simply because I go through a lot more of them. I use my psp for ebooks, typically.