boo! digital — Sharing javascript between client and server

The advent of Node has alot of us coders excited about being able to code both the front end (i.e. client) and the backend (i.e. node.js server) in the same language. Not changing Brain Mode is certainly a good thing. The holy grail though is the possibility of sharing the exact same code and classes between the client and the server. Obviously not all code is perfectly portable, e.g. the browser