Android app creation made simple, google introduces the App Inventor, an App that let you create apps without programming knowledge.

To use App Inventor, you do not need to be a developer. App Inventor requires NO programming knowledge. This is because instead of writing code, you visually design the way the app looks and use blocks to specify the app's behavior.

App Inventor is simple to use, but also very powerful. Apps you build can even store data created by users in a database, so you can create a make-a-quiz app in which the teachers can save questions in a quiz for their students to answer.

Here are some sample apps that were created using App inventor: http://appinventor.googlelabs.com/learn/gallery.html

A 60 second video showing an app being made with App inventor for Android below