One of my favorite popularizers of science is Michio Kaku, a professor of theoretical physics at City College in New York City as well as one of the co-founders of String Theory. With these two books, Physics of the Impossible and Physics of the Future, he takes many of the concepts once thought to be pure science fiction and explains them in such a way that is both accessible and plausible.
In Physics of the Impossible, Kaku classifies SF concepts based on how likely they are given our current understanding of the universe. Class I impossibilities, which include force fields, invisibility, laser weapons, and nanotechnology are not only possible, but many already exist in rudimentary forms. Faster-than-light travel and time travel fall into Class II, which are impossible given our current level of technology, but may be possible in the future if certain theories of the universe turn out to be true (though engineering will still be an issue). Finally, Class III includes out-right impossible concepts like perpetual motion and precognition (seeing the future). Kaku uses his knowledge of physics and his love of science fiction to make heady concepts easy to understand and fascinating to read about.
In the followup to this book, Physics of the Future, he examines the next 100 years in detail, explaining the wondrous possibilities of nanotechnology, virtual reality, genetic engineering, and a developing space industry. I have found Kaku's work not only a joy to read, but also quite helpful when postulating my own ideas about the future. These books are a goldmine for science fiction writers. Even if you have no interest in writing, you should pick up one or both of these. They're brilliantly written, easy to understand, and, above all else, fun.
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