Although I love node.js, but you are missing out on not using Ruby. I used both Ruby (eventmachine) and node.js on a recent project and it was a total awesomegasm. I admit that the Ruby side had some Ruby code converted to C for performance reasons (parsing binary blobs), but we are not rubysts because performance is the only thing we care about. I find Ruby incredibly sexy, be it still cool or not.
Yeah I actually did start working on a Rails project a month or so ago.
Ruby is okay. I like how extremely easy it is to pick up. I don't like that this probably leads to similar problems the PHP ecosystem developed eventually.