bq.The newest books in the New York Public Library don’t take up any shelf space. They are electronic books – 3,000 titles’ worth – and the library’s 1.8 million cardholders can point and click through the collection at www .nypl.org, choosing from among best sellers, nonfiction, romance novels and self-help guides. Patrons borrow them for set periods, downloading them for reading on a computer, a hand-held organizer or other device using free reader software. When they are due, the files are automatically locked out – no matter what hardware they are on – and returned to circulation, eliminating late fees. – Tim Gnatek