A juggler who has written a few Ambigram-related books is Nathan Dorrell.  You can find out more about him online at his website:

http://www.CrazyTieGuy.com

Thanks for the plug Ambigram!  I'll tell a little about the books for those interested.

The first has some ambigrams and a bunch of ambipuzzles.  I call them ambipuzzles because you draw a piece of the puzzle with each part of the story you are telling and then at the end, the puzzle turns over to reveal "the rest of the story."  This book is called "Drawing Bible Stories with a Surprise for the Eyes."

The second book is a bunch of mirror ambigrams that share a message from scripture.  The book contains about 65 different mirror and inverted mirror ambigrams.  It is called "Amazing Mirror Messages:  Reflecting The Truth".

If anyone is interested you can mail order from us or use paypal...details on our websites:  www.CrazyTieGuy.com or www.ReflectingTheTruth.com

In Christ,

Nathan