I've just had my first SF book (collection of shorts) published and while I will not use this forum to advertise it, I wanted to know (for future works) what SF readers look for in a good book? For me, I enjoy reading the works of Clarke, Bradbury, and Herbert. Those are my top three favorites but I'm also a fan of Kress and Le Quin. Right now I have a full-length novel gaining steam in my mind. Oh, and covers. What kind of a book cover catches SF readers' attention? Figure I'd go straight to the source for some answers.