Node.js available for Windows via ChocolateyGallery
In case you don't know (as I didn't), ChocolateyGallery is "somewhat like apt-get but built for Windows". Or, for my mind, it's like MacPorts, but built for Windows. Anyway, it apparently has a large suite of open source packages available for easy install. See http://chocolatey.org/ for more info on the thing.
At http://chocolatey.org/packages/nodejs.install/0.6.11 we see that Node.js installation is as simple as
C:\> cinst nodejs.install