On behalf of everyone on the Flex and Flash Builder product teams, it is with great pride that we can announce that the final versions of Flex 4 SDK and Flash Builder 4 are available for download today!

We’ve been working hard on these releases to make the Flash Platform the best RIA development platform ever and one that you can confidently bet on when you are asked to create your next generation applications.

In the Flex 4 SDK, we’ve implemented a completely new component and skinning architecture (Spark) that supports a level of expressiveness in RIAs not seen previously. With the new Spark component and skinning architecture, component logic is "divorced" from component visuals such that customizing either the behavior or look and feel of the component is much more straightforward. Additionally in the Flex 4 SDK, we have improved the Flex compiler performance, enhanced numerous language and infrastructure features and provided first-class support for the new runtime capabilities in Flash Player 10.

Lees meer op http://blogs.adobe.com/flex/