The book went straight to the top of Amazon's gardening section when the publisher released it last week - I couldn't believe it. Guess a lot of folks are interested in making their own fish emulsion, composting meat, etc. I love to see people reusing all that they can rather than consigning soil fertility to the waste stream.
A lot of it covers materials that I've discussed with you guys over here, including the "Melon Pits" thread:
At the moment, yes. My publisher wanted to release to a wide audience at a low price point, hence the cost of only $2.99 for the Kindle version. I've been informed that a paper version will be coming soon after the introductory period on Kindle.