Here is some helpful stuff related to the book:
The article that started it all for me
In February 2006, when all of the excitement about Rails and Ruby was just coming to a boil, I wrote a short article in my blog about, well, design patterns in Ruby. This caught the attention of a brilliant editor of very refined literary tastes over at Addison-Wesley (Hi Chris!), and the rest, as they say, is history.
Looking back on that original article makes me shiver a little bit (hint: I got some things wrong). In any case, you can read it for yourself.
The lost Facade Pattern chapter
I had originally planned to include the Facade Pattern in the book, but in the end I didn’t. I did however, write a draft of that doomed chapter and here it is.
Jochen Hayek was kind enough to put this outline of the book together. This is an OPML file, essentially an XML outline.
Alternate rendition of the example code
Article on the structural design patterns
Article on the Template Pattern
You can also find a good discussion of the Template Pattern over at DockYard’s ReefPoint blog
Martin Fowler talks Circuit Breaker