The Internet is producing lot of web sites built on different platforms and using different languages. The shape of the web sites are still changing and the latest one is RIA or Rich Internet Applications). RIA applications are preferred by many companies for its interactivity and robustness.

Adobe flex is a great development tool for building RIA. A developer using this tool can build amazing functionality to a web application. It is easy to learn and master the concept. Moreover, the SDK is open source and Eclipse can be configured to use Flex. Additionally, a full fledged IDE Flex Builder 3 comes which makes development a lot easier.

For more information read Developing with Flex.