Alchemy is a research project that allows users to compile C and C++ code that is targeted to run on the open source ActionScript Virtual Machine (AVM2). The purpose of this preview is to assess the level of community interest in reusing existing C and C++ libraries in Web applications that run on Adobe® Flash® Player and Adobe AIR®. (adobe)
This opens pretty huge space for developers to do some processing different way. C++ operations runs faster than ActionScript and what is even better you can run your processing asynchronously. Good job adobe!