I need your help!

I was watching an episode of CSI just now, and heard a song which, after some sleuthing, I identified as End Theme by Zero 7. What troubles me is that I know I've heard it before, but I'm unable to figure out where. If you know where I might have heard this song before, please lend me some insight. At first, I thought of "MirrorMask", a movie I saw just the other day, but I can't find any proof that that's what it was.

Listening to... End Theme - Zero 7
Link of the moment... I'm pretty sure it's nothing listed on here