Few months back, everybody was talking about this application by Google which made even non-developers with no coding knowledge make something for Google Android. Good news is that the application is now available for download and can be used by anybody who has a Google account.
App Inventor is a browser based application which talks to the Google cloud to give you the Google app inventor services. As per the normal IDE, you get a Code editor and an UI designer tool with the application. Code Designer is to assign behaviours to each tool and tools are designed using your designer.
Macintosh (with Intel processor): Mac OS X 10.5, 10.6
Windows: Windows XP, Windows Vista, Windows 7
GNU/Linux: Ubuntu 8+, Debian 5+
Mozilla Firefox 3.6 or higher
Apple Safari 5.0 or higher
Google Chrome 4.0 or higher
Microsoft Internet Explorer 7 or higher
Link: App Inventor