To start with, it is well laid out. Fiction books are placed in genre blocks by alphabetical order (by author). Non-fiction books are also well organised. Too often I've gone into book shops where books are placed apparently haphazardly, or the books are shoved in wherever they fit, so the authors are spread out everywhere. Bookworm Junction's layout makes browsing much easier.
All major fiction genres are represented, with a wide selection of horror, fantasy and science fiction, crime, romance and war books particularly. In non-fiction, most topics can be found on the shelves, from paranormal to sport, true crime to biography.