He wrote about Mindscape Web Workbench extension for the Visual Studio, which adds CoffeeScript, Sass and Less support into it.
As for me I really liked CoffeeScript & Sass. Below are some quotations and screenshots from the original article.
II. Sass could mean Super Awesome Style Sheets. It’s up level your abstractions and favor the more expressive language. Your Sass files are converted into CSS as you click save in Visual Studio. It's a wonderfully clean integration.