I wonder if there are cheat cheets for all design patterns implemented in Ruby so that you don\'t have to reinvent the wheel.
This document has nice examples of actual implementation of some of the design patterns from the GoF.
It may be a "cheatsheet", but I don't think is a silver-bullet reference for design patterns because they emerge once you have analyzed a problem, and the pattern fits the solution you're giving. Is not a recipe, but rather a good reference.
And, of course, is the great book Design patterns in Ruby