I am impressed by my first impressions of node.js. It feels very Unix-like. If you want to develop node in emacs, a good place to start might be Truong TX blog. My setup differs a bit from his. You can find my whole emacs environment on github. Outside of emacs, you of course should have node and npm installed. I then installed Tern with ‘npm install tern -g’. The relevant snip from my emacs init is below
(require 'yasnippet) (yas-global-mode 1)
And with that, you should be able to settle into some nice node tutorials.