Google has targeted education with App Inventor, but its clear that the tool will attract major interest from programmers and web designer/developers. Programmers see the potential because of the the TinyWebDB component which allows an App Inventor apps to communicate with web services.
Early adopter Dean Sanvitale has already built an RSS reader app and a Flickr explorer app. He did this by modifying a sample “tinywebdb-compliant” web service to create http://tinywebdbplus.appspot.com/ then writing an App Inventor client that talks to it. The pic on the right is his RSS reader app running in an emulator.
For more on how to build App Inventor (tinywebdb-) compliant web services, as well as sample source code, see http://appinventor.org/talking-to-an-api and http://appinventor.googlelabs.com/learn/reference/other/tinywebdb.html (The sample is written in Python/App Engine)
Good work Dean and, programmers, rev your engines!