To be honest, I haven't had time yet to check out the new Beta release of Flash Player 10, but there are a lot of exciting new features that every Flash programmer should be excited about. Foremost among the new features is the native support for new 3D Classes within ActionScript. Flash Player 10 still uses ActionScript 3.0, but it also supports a number of new classes and methods that will make working with 3D a walk in the park.
Since I haven't had time to check out these new features, I'll have to point you elsewhere for tutorials. On the FlashAndMath.com website, there is a great tutorial to help you get started playing around with 3D for Flash Player 10.
