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/