Like, duh. There are plenty of amazing fanvidders out there and much of their work I have loved and praised, however I chose this specifically because not only has it been currently playing in my head, but it's beautifully well-done with the editing, the use of colors and effects, right down to the matching of lyrics to the images, as well. Even though short, it's still effective. To the point where every time I listen to this song, I think of Dean/Cas. It's totally their anthem, I swear. AND DON'T LIE, YOU ALL KNOW YOU LOVE IT TOO. ;)
Oh, and while this isn't necessarily a fanvid, the Are You Watching Supernatural? fan-made promotional vidlets are quite good, too.
Rest of the 30 Days of Supernatural Challenge.