StackHose is a continuously updated stream of new content from Stack Overflow. It uses the Firehose JSON streaming event service to get a "push" stream of new event notifications. The newest notifications are added to the top of the list.
StackHose itself is licensed under the WTFPL.
This currently works in Chrome, Firefox, and Safari. It does not appear to work in Internet Explorer.
It's just HTML with a bit of jQuery. Right-click, view source.