Wat is a tiny language with powerful concurrency and metaprogramming features for embedding in JavaScript programs.
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Delimited continuations http://www.cs.indiana.edu/~dyb/pubs/monadicDC.pdf
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Delimited dynamic binding http://okmij.org/ftp/papers/DDBinding.pdf
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First-class lexical environments and fexprs http://www.wpi.edu/Pubs/ETD/Available/etd-090110-124904/unrestricted/jshutt.pdf
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First-order control (sequential, conditional, loop, throw, catch, finally) running on JS stack
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Interop with JavaScript objects, functions, and callbacks
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JSON-based bytecode for embedding Wat code in JavaScript
Wat is developed by Manuel Simoni (msimoni@gmail.com).
<html>
<head>
<script type="text/javascript" src="./build/wat.js"></script>
</head>
<body>
<script type="text/javascript">
var vm = wat.vm();
console.log(vm.eval("(+ 1 2)"));
</script>
</body>
</html>
> var vm = require("./build/wat").vm();
> vm.eval("(+ 1 2)");
3
For now, follow http://axisofeval.blogspot.com/search/label/wat and/or https://twitter.com/msimoni for updates.