For those who ask what it is : PubSubHubbub and Webhooks (HTML5) integrated. Gowalla publishes its feeds thru PubSubHubbub. I built a small node.js server that

For those who ask what it is : PubSubHubbub and Webhooks (HTML5) integrated. Gowalla publishes its feeds thru PubSubHubbub. I built a small node.js server that can subscribe to these feeds. Then, this exact same server is a WebSocket server. The browser open a websocket connection to the server, which then subscribes to the hub. When the server gets updates it pushes them to the browser.