This is probably the best book available on how to build usability into a website. ‘Usability’ means: enabling visitors to find what they are looking for, and present it to them in an intuitive way they can easily understand. Few websites implement all Steve’s common-sense recommendations, and lose out as a result. He also provides a vital section on how to use other people to test a website. Despite the price, this is an essential read. (Try Amazon’s second-hand links, usually less than half-price, or your library.) Read sample chapter online, where you can also see a range of Steve’s other resources and ideas.