Just ran across this on adafruit.com:
Looks to be a very useful thing.
May 12, 2012
We've been having great fun building a multi-client web-based control system for Silicon Valley Lines. Hacking with nodejs is quite fun, and is reminiscent of my days writing my first programs in BASIC. Using a dynamic language to build prototypes lets us move quickly to and stay focused on building a solution. Still not sure I'd use this for my "real job", but it is fun to play with.