Another Node-based WebSockets implementation.

A notification system "based on the Bayeux protocol". Very similar to Socket.io in terms of usage. From the "Architecture" page:

The Adapter, as implemented by the NodeAdapter and RackAdapter classes, exposes the Server’s interface over HTTP. It is responsible for serializing and deserialzing messages as JSON and accepting connections over various flavours of HTTP transport:

Persistent connections using WebSocket
Long-polling via HTTP POST
Cross Origin Resource Sharing
Callback-polling via JSON-P

Rob Hawkes again with Socket.io and NodeJS multiplayer gaming. Very cool.

Cross-browser WebSockets. Client-side, or server through Node.

Rob Hawkes on developing multiplayer games in HTML5 with WebSockets.