I've always wanted to get this going since seeing this Lennart Schoors post, but this Lee Mallabone tutorial finally pushed me to do it. The debug settings are specific to Rails, but if you're a CodeKit users you probably just do this.
In the past I've thought: I don't need no line number mapping! My SCSS is so organized and modular I can always jump right to what I need to edit. But I could smell defensiveness and stale attitude as I thought it, so here's to being open minded and giving ourselves better tools.