The new Flash Player 9 update 3 has been released on the Adobe Labs
Flash Player 9 Update 3 introduces a new property called fullScreenSourceRect on the Stage object. It is available in ActionScript 2.0 and ActionScript 3.0. This property allows developers to specify which part of a SWF is displayed in full-screen mode. This allows Flash Player to leverage hardware scaling which can significantly improve quality and performance.
Read the full " Flash Player:9:Update:Full-Screen Mode HW" article.
You can download Flash Player 9 from the Flash Player Download Center. For an overview of Flash Player features, visit the Features section of the product page.