Jakob Nielsen.
Designing Web Usability.
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This is the latest of Jakob Neilsen's books on the topic of usability. As the title suggests, the focus of this book is on usability design for the web. This book and has recieved good reviews from readers.

Jeffrey Rubin.
Handbook of usability testing.
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"Got usability?" This book is great for beginners and a good reference for those more experienced.

Jakob Nielsen.
Usability Engineering.
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Jakob Neilsen, the author of the best-selling book HyperText & HyperMedia, has been a popular figure in the usability field for several years. This book provides an excellent guide to the methods of usability engineering. This book and has recieved good reviews.

Jakob Nielsen.
Handbook of usability testing.
Learn more about this book (hardcover)

Jakob Neilsen has been a popular figure in the usability field for several years. This book details the state of the art in usability inspection and also explores the more practical aspects of comparing the methods and applying them.