Effective use of Node.js and Socket.io for building a HTML5 Game

If you want to make this easy, use https://github.com/socketstream/socketstream. Great progress is being made on the 0.3 version and it makes pub/sub broadcasting and message pushing very easy. You wouldn't be the first person to make a live multiplayer HTML5 game with it: https://github.com/alz/socketracer.

Buried source as a mediafire link? Author needs to learn about github.

Code itself is pretty difficult to read and quickly pasted together, but otherwise a decent example on how to tie the technologies involved together.

Check out now.js (http://nowjs.com/) as well, makes it really easy to make realtime apps

To install socket.io you need only execute `npm install socket.io`

This installs socket.io from the npm registry (there is no need to download/extract the zip).

-g if you want to make it globally accessible.

Yeah, but there is not much value in installing socket.io globally, as you can't require() it. It makes sense only for executables like coffee-script

You can definitely require() modules after installing them globally.