Adobe just launched the Starling Framework today, in tandem with the official announcement of Flash Player 11. The Starling Framework allows simple AS3-style syntax access to Stage3D features, which means you can build 2D content that accesses the performance advantages of rendering on the GPU. Which, according to Adobe, will net you performance increases of up to 1000X. If you are a ActionScript 3.0 codes, and you were to access Stage3D features manually, you'd have to learn a whole new set of APIs, most of which are really low level. Starling provides a nice abstraction, and will let you code just like you were adding items to a normal Flash display list. ..
10.3 in BETA08-Mar-2011
Learn about FP 10.3 features (http://labs.adobe.com/technologies/flashplatformruntimes/flashplayer10..