It’s in beta right now, and you’ll need to apply with your gmail account before you can use it, but it looks like a great learning tool that may lure many young minds into the world of software development. As the tools get more powerful in the future, the quality of apps created using Google App Inventor should grow.
I didn’t find a glade template for this one, but I’m starting to lean away from using a gui builder. It seems more trouble than it’s worth.