Nice slides. I see that my Class::BuildMethods faired poorly, but for reasons other than what I expected. I was generally against the idea of adding anything to this as I deliberately wanted the code to be simple, but from what I can see from your slides, there are some extremely useful features I can provide while still maintaining the simplicity.
Out of curiosity, what technique would you suggest for me to avoid the HoH? I could create a package hash inside of each class and store things there directly, but that breaks encapsulation. However, it only does that in the "please stay out of the kitchen" sense, not in the "decouple code from implementation" sense. Do you think that would be sane?