A timeless book, The Design of Everyday Things explores the fundamental
principles behind all design, and how to understand the psychology behind how we use things, and why they frustrate us.
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Pros
Pro Transcendental principles
This book isn't focused on recent trends or properties specific to a certain field, and thus applies to all design. It provides a broad view and allows focusing on the fundamental goals of the user experience, rather than being limited in scope.
Pro Focused on the user
Whatever that's being designed, for whatever purpose, it always has the same goal of being used by someone. This book is focused on that interaction and on why users make mistakes. These principles still apply directly to web design, when design leads users to make mistakes, it will ultimately drive users away.
Cons
Con Quite dated
Examples are quite old, as are the illustrations.
Con A lot to read
It's quite a long read, there is a lot of material to be covered, if you compare it to similar but more concise books, like The Non-Designer's Design Book.
Con Not specifically for web design
This book challenges the reader to think about the design of all objects, and their user-friendliness/usability. It is not specifically targeted towards web designers, but will help web designers think in a way that benefits users.