In 0.7.0, "Experimenetal isolates support" [sic] was introduced. I never understood this besides some vague idea that they gave threading-like capabilities but without the problems of threads. And maybe were good for solving Node's debugging/error handling story.
But, nobody ever explained what they were, either in that blog, or in the first few Google results. What are isolates? Why were they introduced to Node?
Explained here: http://groups.google.com/group/nodejs/msg/6b8b8a487d2ab817
Ben just scooped me before I could get the message sent :)