I haven't read many books on or using Smalltalk, but I can definitely recommend Kent Beck's "Smalltalk Best Practice Patterns"

https://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent...

I've learned a lot from building a system in Smalltalk and these books:

https://en.wikipedia.org/wiki/Design_Patterns

https://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent...

A remarkable classic http://www.amazon.com/Design-Patterns-Elements-Reusable-Obje...

And Kent Beck's http://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent/...

Cool. Looks a lot like an excerpt of Smalltalk Best Practices[1] and a bit of Refactoring[2] book together.

[1] http://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent/...

[2] http://martinfowler.com/books.html#refactoring

No idea about his programming skills, but I have read Kent Beck's Smalltalk Best Practice Patterns and it is pretty useful and it was often recommended to both Smalltalkers and non-Smalltalkers.

[1] http://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent/... (it's not a gang-of-four-type patterns book, more like a style guide.)

And that book is Smalltalk Best Practice Patterns (http://www.amazon.com/Smalltalk-Best-Practice-Patterns-Kent/...). Not anything like the design patterns book in case anyone wonders, and it's a good read even if you don't do Smalltalk.