The webapp is great, I just wanted a screen too. I got lucky finding the kit when I did because they wanted testers so it was cheaper and I could sign-on to google talk at certain times to ask questions and give them feedback on how easy it was or where I ran into problems. But in the agreement I was told I couldn't post any Arduino code until they were done testing, which we already finished, and came out with their proper kit. I didn't get to download the webapp because they were making constant changes, but I know the it comes with the book because part of each chapter talks about the sensor/arduino/webapp working together. Uploading and customizing just wasn't part of what they were testing. It runs on Google's App Engine so you need a Google account and it's written in Python which was another plus for me because my only programming experience ever was with Python.
Thanks for uploading the bigger picture, that helps. Someone turned me to this Adafruit screen: http://www.adafruit.com/products/181
It looks like the same one and they have a tutorial so maybe that will answer your power problem? It takes up too many pins for me so I think it's out for my solution. From the tutorial it seems the screen was meant to be powered in the Arduino's power range so the 9.6V might damage it.