I am speechless.
Somebody on Hacker News just posted A Minecraft-like Block Based Game Engine Using Three.js, WebGL and Node (badassjs.com).
This is already cool.
But in the comments somebody else promoted BLK – a project from Ben Vanik – a Google employee – who created BKL in his 20% Google spare time.
I set up a server on Amazon EC2, and the t1.micro instance was seconds ago populated by people – building things.
The Minecraft effect is incredible.
[EDIT] link to the main page is here.