+1 
Metacello is the way to go!
Dale I will update the chapter as soon as you decide the new API :)
I'm working on a nice process document for our little community. Stay tuned :)

Stef


> My opinion that being able to build images from scratch (easily and reproducibly) is a "requirement" to get in the door  for mainstream projects... giving mainstream developers the opportunity to work in a image-based environment will set them free:)