I'm in the middle of your book now, it is helping a lot! To the original poster, check out Building Wireless Sensor Networks- it won't be directly applicable because you are using Series 1 instead of Series 2 radios, but the concepts in it are really informative.
The place where I would like to see more examples is in the API sensor networks. I caught on to the first four chapters of your book really easily, but Chapter 5 really takes it to another level, and it's easy to get lost. Here's a couple of ideas for examples:
A really basic API network like the Simple Sensor Network- Coordinator, 2 router, single sensor on each router. Take out the Processing part- can I get it to just show 2 temperatures in CoolTerm? I feel like this decreases a lot of opportunities for error. Once I make sure the XBee part is transmitting correctly, I could add in the Processing part to make it look better.
Multiple Sensors on a single radio: My application is attaching a GPS sensor to the XBee so I can monitor its location and temperature. Getting the NMEA data from the GPS transmitted over the XBee has been really challenging for me, and adding another sensor complicates things further. I'd love to see an "asset tracking" example that includes GPS and an analog input.
Using this for the GPS: https://www.adafruit.com/products/746
I haven't gotten to the Internet portion of the book yet, but I'm curious to see the use of the ConnectPort hardware. It seems that the Tweet-a-watt project got away without having to purchase this piece by writing its own Python Scripts, and I can't tell yet if I will be able to do the same for my application. It significantly adds to the cost of the project, and seems like a ripoff for a small ethernet adapter board. So an example that serves the sensor information to the internet without having to use the ConnectPort would be much easier to learn on.
Thanks for all the help!