It's like sass --watch, but for Node!
npm install -g sass-watch
sass-watch path/to/input/directory path/to/output/directory
sass-watch is really simple. Like, really. All it does is watch a directory, and when scss files in the input directory are added/changed/deleted, those changes are reflected in the compiled css files in the output directory.
Copyright (c) 2013 Duncan Smith MIT License (see LICENSE for details)