The Psychology of Everyday Things
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The Psychology of Everyday Things is about user interfaces in the large. We software folks aren't the only ones who have messed up users! This book is required reading for anyone who bridges the gap between users and developers.
Don Norman is very interesting to visit at http://www.jnd.org/ where he has other rants as well as biography. You have to enjoy someone with a PhD in Psychology as well as Electrical Engineering. A great mind and a great read.
The book is also titled "The Design of Everyday Things" in the paperback version.