Can you give a quick run down on why I should be interested? I gave it the standard "very quick look" and didn't make any headway.

It's a javascript extension. i.e. you write javascript in a:

    <script type="text/sjs"> ... </script>

block, which is parsed and compiled into native javascript. It allows you to write asynchronous javascript using straight forward syntax. e.g. pause execution (hold), split code into parallel tasks, split code and automatically join when one branch finishes (function @ function - think search), and suspend/resume code using events.

It's very cool and now I'm going to start looking for an excuse to use it.

Thanks. I get it. From your short description sounds like more human overhead involved in planning how to do it as opposed to using worker threads (not available in IE yet).