There are quite a few computer-related "cookbooks",
including ones on jQuery, Ruby, SketchUp, etc.
These books typically contain hints and short, well-explained examples
that programmers can adapt to fit their own needs.
Unfortunately, I'm not aware of any such cookbook for SketchUp Ruby.
So, I'm starting one here, based on my own needs and discoveries.
Please feel welcome to email in contributions
(regular contributors can request wiki editing privileges).