Earth User's Guide to Permaculture by Rosemary Morrow is a decent book. It
is more rooted in small-mid size practicality than large scale theory.
iPermie by Bob Waldrop <http://www.ipermie.net/> is a huge detailed
doorstop of an ebook. That said, it's got a lot of overview, a fun short
story, and a lot of stuff that gets out of the "core" permaculture canon
and out into Social Permaculture. He's got a big chunk of the book online
for free, and he has priced it to SELL- he could be selling it for 10x as
much and still be a good value.