Act on asynchronously loaded arrays via forEach, map, etc without the usual, messy callback interface.
Use CommonJS and NPM modules from the browser
Socket.IO middleware for Connect. (Or use Connect middleware from Socket.IO)
Simple OO Class factory
Add the Deferrable Pattern to Your Dependency Graphs
Ubuntu growl-like notifications for node.js
An addon to node.js that provides a binary search function that runs in native C++.
A Complete Redis Client for Node.js
More types for mongoose