This came up in a search on "paleo" in publication date sort. This
book is free only today. It was also free back on July 4th, and I
announced it at that time. It is a regular print book that costs $12
in paperback.
Quantum Paleo by Doug Willen
http://www.amazon.com/dp/B0082M54O0
The book has many non-specific glowing reviews. Probably fans from
his various websites: http://www.dougwillen.com/