With a tiny bit of work, node.js is now available in a totally portable format for Windows.
Here's the download link: Node.js 0.6.8 (2.6 MB) (100% safe)
To start using it, extract the file, and start node.cmd.
NPM has been tested and works well.
It's been a week since I first told the Internet about cssFx and the response has been amazing. I've received over 12,000 visits to the cssFx page so far, and people have found the script immediately useful.
There are still some hurdles on the way to 1.0, such as @import and media query support, and I'm hoping to get there under or around 5K, so I have my work cut out for me. cssFx has come a long way since June, and I'm glad people are finding a use for it.