Professional web designers probably read the highly popular first edition of Don’t Make Me Think: A Common Sense Approach to Web Usability when it came out in 2000, but the second edition is worth a re-read, because author Steve Krug has honed his craft to a fine point, and everyone can use a refresher on the basic principles of usability and user testing.
Amateur designers may not have heard of “Don’t Make Me Think” — and if so, they should grab a copy right away. The book, like its subject matter, is light, minimal and to the point — a slim volume designed “to be read on a plane” (in the authors words) but covering some of the major problems that make websites difficult to use.