In the new 0.5.1 branch, there is an official Windows executable of Node.js. The Linux version of Node.js uses established libraries such as v8, libev, libeio.
Since libev and libeio is for *NIX platforms; is the Windows port of Node.js ready for production use, or is it only for development?
0.5.x branch is unstable. Even branch numbers are stable and odds are unstable, so you will have to wait for the 0.6.x if you want it production ready and stable.