As the 'rules' in this iconic book take up only 14 pages, it continually amazes me how often I can find the answer to a grammar or punctuation guestion within those pages. It doesn't cover everything, and some of the 'rules' are of course changing with the passage of time - but if a wannabe writer can't afford a whole bookcase of tomes on How to Write, then this is the one he or she should buy.
Beyond those 14 pithy pages, however, are another 100 or so that extend the value of the book immeasurably: Principles of Composition, Commonly Misused Words, and perhaps the most valuable: An Approach to Style, which gives excellent advice along the lines of Do not overwrite, Avoid qualifiers, Don't over-explain, Avoid adverbs, Avoid dialect, Don't inject opinion, and tons of others.
When all's said and done, however, one of the very best parts is a wonderful essay by the inimitable EB White himself - the Introduction, which serves as a perfect example of all that the rest of the small book preaches: write concisely, clearly, and well, and say something worthwhile.
Other books for writers to consider: Bird by Bird, On Writing, and Writing Down the Bones.

I was looking for a book with basic rules of english grammar to improve the presentation in my recent report and forthcoming thesis. Something that had all in one place, was concise, to the point and no novel-likeness. Strunk & White was the prescription. It has everything a writer needs in terms of language and some aspects of style and presentation. It speaks of the obvious but precious gems which people tend to forget over time. I am impressed with the organisation of the book. What I was really looking for was, Elements of usage and An approach to Style. I recommend this for students planning to write reports, thesis, term papers or any sort of writing that needs to be crisp and clear.The Fine Art of Technical Writing by Carol Rosenblum Perry would be an excellent along with the "little" book for students. It's a necessity if you are in the academia, it's a great aid otherwise.

When I write a book I use only a handful of reference tools: dictionary, thesaurus, Gregg's Reference Handbook, Writers Market, and the Elements of Style. Strunk and White is a wonderfully-written, extraordinarily concise tool that pays homage to classic high-end English. It takes language insight to make this prediction in 1979: "By the time this paragraph makes print, uptight... rap, dude, vibes, copout, and funky will be the words of yesteryear." The book begins with eleven "Elementary Rules of Usage," and then continues with eleven more "Elementary Rules of Composition," and eleven "Matters of Form." Each is presented as a brief statement followed by another sentence or two of explanation and a few clarifying examples. This amazing compilation fills only thirty-eight pages, yet covers ninety percent of good writing fundamentals. My favorite section is Chapter IV, a twenty-seven-page, alphabetical listing of commonly misused words and expressions. Here's a trade secret: when my manuscript is "done," I then turn to this chapter and use my word processor's Find function to study every instance of all these problematic words and phrases. I never fail to find errors this way. Many great writers are so only because they've learned to make use of the best available tools. The end of the book contains an essay on "An Approach to Style" with a list of twenty-one "Reminders." Those who fight the apparently-natural tendency to go against these recommendations succeed as writers. Those who don't, fail. It's that simple. The single drawback of The Elements of Style is that it's too concise; it does not stand alone as an all-encompassing tutorial or reference guide. Many readers will seek other sources for more in-depth explanation of style elements. Despite that, it easily replaces ten pounds of other reference material. --Christopher Bonn Jonnes, author of Wake Up Dead.