Don't Make me think. Steve Krug (2nd ed)

Don't Make Me Think. Steve Krug (2nd ed). 2006. ISBN 0321344758. A Common Sense Approach to Web Usability. If you are wondering why your web site does not "work" then this is one of the books you need to read. Pragmatic, web tested and quickly applicable, this book will help prevent you from making the most common mistakes. Of course he does not help with the "content" you are placing there nor how you need to guide the various types of viewers to the most appropriate materials. But, this is much better than doing nothing to fix your sites usability. Two hours to read ( well written and clear), a lifetime to master.