It's not node.js that feels unstable -- it's the shifting libraries that make it feel unstable for me. I was going to do my project in node.js, and might still, but a project that I get maybe a few hours a week is just not going to work with something moving so fast.

I think if I was on a startup with it, I'd feel comfortable as long as my first patch or two was accepted on the projects on which I depended.