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Ryan Dahl is the creator of Node. It currently is around 11k lines of C++ code, along with 6k lines of JavaScript. How do you like that? The JavaScript helper is itself written partially in JavaScript.
Node is good for small projects. It does not scale that great if you are dealing with large files. This is server side JavaScript for a lot of connections. The author believes frameworks will be written on top of Node. I am going to try to learn JavaScript, and then dive into Node.