Here's the full feature list from the ReadMe:

• True bi-directional communication using websockets (or flashsockets)
• Crazy fast! Starts up instantly. No HTTP handshaking/headers/routing to slow down every request
• Works great with Chrome and Safari. Firefox and IE support (using flashsockets) temperamental but improving thanks to Socket.IO
• Write all code in CoffeeScript or JavaScript - your choice
• Easily share code between the client and server. Ideal for business logic and model validation
• Works great on iPads and iPhones using Mobile Safari (iOS 4.2 and above), even over 3G
• Automatic HTTP/HTTPS API. All server-side code is also accessible over a high-speed request-based API
• Effortless, scalable, pub/sub baked right in - including Private Channels. See examples below
• Integrated asset manager. Automatically packages and minifies all client-side assets
• Out-of-the-box HTTPS support with auto HTTP redirects. See HTTPS section below
• In-built User model with modular authentication. Automatically keeps track of users online (see below).
• Interactive console - just type 'socketstream console' and invoke any server-side or shared method from there
• 'API Trees' offer a simple, consistent way to namespace large code bases across the front and back end
• Uses Redis for fast session retrieval, pub/sub, list of users online, and any other data your app needs instantly
• Supports custom HTTP middleware/responders which execute first for maximum flexibility and speed
• Bundled with jQuery and jQuery templates. Works like partials in Rails.
• Easily add additional client libraries such as Underscore.js
• Uses Jade to render static HTML
• Uses Stylus for CSS
• MIT Licence

Three sample apps are provided in the Readme.