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Sun has released (BSD License) a reference implementation of the Fortress programming language. Fortress is a parallel programming language developed under the DARPA HPCS Program. Fortress is designed (like Fortran was) to work with mathematical functions (almost like you would write them on paper). They have amazing example of the NAS CG benchmark (originally written in Fortran) rewritten in Fortress (pdf). One should note, the code is a command line interpreter. It is intended as a research tool, so don't throw out your Fortran compiler yet. And, no it is not Java. There is an article with more information at c|net news.