Just wanted to let people know I found a great book, "The Hands-On XBee Lab Manual," on Amazon. It has 22 experiments that start with the basic info about how to use XBee modules through how to set up a network, use sleep modes, send broadcast messages, etc. The author is Jon Titus, a guy who writes for several magazines and has a ham-radio license. Titus gives readers step by step instructions and experiments. Many helpful appendixes, too. The book has two 5-star reviews on Amazon and IMHO, it deserves them. Great book for people who want to use XBee Series-1 modules in robotic projects or for other purposes. Good stuff--MUCH better than the info from Digi. --Robocat