This is meant to be a series, so the second article (which talks about the Image Store) is found here: http://blog.scalr.com/post/55282745486/cloud-native-the-imag... (Didn't want to spam post!)

I think it was Randy Bias that introduced the idea of pets vs cattle. See his presentation at http://www.slideshare.net/randybias/architectures-for-open-a...