While searching on the web, I found these three Muay Thai PDF books that I think you will like to see as well.
The first book, called "Muay Thai - The Art of Fighting" has some extremely interesting Muay Thai information and is over 250 pages long. It contains information on the history of Muay Thai (including pre-fight rituals), Muay Thai traditions, master tricks, combinations, training drills, conditioning, and how to wrap your hands. Trust me, get this guide (hey, it's FREE!).
You can get the book here: Muay Thai - The Art of Fighting - (7.04 mb)
The second Muay Thai PDF is taken from the Muay Thai Phuket Magazine, called "How to Score a Muay Thai Fight" which will interest you guys out there that compete in Muay Thai fights. It tells you the best ways to score points and how judging is done.
Get it here: How to Score a Muay Thai Fight - (4.41 mb)
The last Muay Thai PDF called "Muay Thai Clinch meets MMA Takedowns" has information of the clinch (the head grab in Muay Thai) and MMA take downs. Full of step-by-step pictures, this is a great guide to read.
Download it here: Muay Thai Clinch meets MMA Takedowns - (422.74 kb)