The Computer Science Education Week coincides with the “Hour of Code” initiative. This example lesson is based on MIT’s Scratch (which is similar to App Inventor).
There are 33 introductory tutorials available for the “Hour of Code” project (teachers may optionally create their own as well).
One of the official tutorial opportunities is based on App Inventor.
Use caution in interpreting the hype over “Hour of Code”. It’s a primitive introduction to some limited programming concepts; many of the tutorials have limited association with computer science. If your expectations are set appropriately, its fine.