Computer Books For A Library?

Basalisk asks: "I've been asked to come up with a list of suggestions for books covering computer subjects that would be appropriate for a public library. Ideally, the books suggested would have a fairly long shelf life and cater to as many different audiences as possible, from the absolute beginner to an experienced geek. What books dealing with computer subjects should a library have on it's shelves?" Considering that library books need to have lasting and generalized value, not just programming fads of the month, what books would you recommend for a desert-island library collection? What books won't you give up on your tech-library?