Hadoop and JavaScript

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Microsoft has announced limited preview version of Hadoop on Azure. JavaScript can also be used to write MapReduce jobs on Hadoop. As of now, Streaming allows any scripting language which can read/write from STDIN/STDOUT to be used with Hadoop. But, what Microsoft is trying make is make JavaScript a first class citizen for Hadoop. There is a session on `Hadoop + JavaScript: what we learned' end of February, which is too long for the impatient. BTW, here is an interesting article on using JavaScript on Hadoop with Rhino.
There had been a lot of work on JavaScript in the browser area for the last few years to improve the performance (especially V8).
Can anyone share use-cases or their experience using JavaScript for HPC (High Performance Computing) in the comments and I will update the blog entry accordingly?

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