Violating copyright or not, I give kudos to those folks who scan those OOP books that will never get an official ebook release. You know, those books from authors who only published a couple of books and were never heard from again, or who died young and never fulfilled their literary promise.
Just came across one recently, of a sci-fi paperback that I actually own and have packed away in a box somewhere, and it was good to see that book and that author's name again, and know that others will finally be getting a chance to read that book again.
If I had a scanner, and was willing to dismember my books, I've got a few of them that I would convert to ebooks just to get them back into circulation because you simply can't find them anymore, and I happen to think that having the book available to readers is more important than some publisher sitting on the copyright with the story gathering dust and remaining unavailable.