Indeed. IMHO the concerns expressed by some here about relying on Ruby are greatly exaggerated.
For anyone who is curious, the steps required to use SASS on Windows are something like:
1. Download RubyInstaller from rubyinstaller.org and run it. (This is a self-contained Windows installer for Ruby and the related tools/documentation.)
2. Run "gem install sass" at a command prompt. (This downloads and installs SASS itself, including SCSS.)
Personally, I'd love it if Ninite picked Ruby up as an option, because I already install many other tools that way in a single step. However, installing Ruby manually is no harder than installing any other piece of Windows software you download, and installing SASS on top is literally a one-liner.
Unless you're developing on a relatively old and low-powered system, I don't see any downside to having the extra software installed either: it's just another tool, occupying a few MB of hard drive and a few characters in your PATH, and IME it's perfectly friendly toward development toolchains for other languages.