Yes, I bought your ebook last night pre-rant and gave it a quick once over. It's was pretty low level. I hope you might consider adding some labs at the end to tie it together at some point.

Cfengine looks like it's in for the long haul. I think with a proper framework it would even be useful in the single rack applications I desire. Think Ruby on Rails vs. roll your own everything. That's what I'd like to see on top of something like Cfengine.