In 1996, as a novice Smalltalker and Object designer in college, I read the GOF Patterns book. The potential power of patterns were immediately obvious but the concepts of applying them in practical terms was not!
This book presents the GOF patterns from a slightly different perspective and its examples of practical applications, code snippets and references to the various Smalltalk dialects was invaluable and "tied up a lot of loose ends" for me.
The book is a perfect companion to the original GOF patterns book and I feel it will stand in its own right as a valuable patterns resource. As such it should become part of any Object designers personal reference library.
Congratulations and thanks to the co-authors.