I'm pretty sure this is mentioned in Revelations as one of the signs of the end times. But it's pretty darn technically impressive nonetheless.
On some of the church media groups I'm part of, there's some speculation that it was faked with Photoshop and a video editor. If so, it's also pretty amazing, because they got all the lighting details right (shadows, a radio tower in the distance, etc.). And further evidence it's for real is that you don't need to jury-rig something like this. There are off the shelf products you can buy to do this. And of course, you'll want the 200,000 hour LED Christmas lights to do it right. (Be sure to check out the video on that site, which shows them demonstrating the durability of the lights by driving a semi over them. The lights surving a troupe of clog dancers or 30 seconds with a three year old would be more impressive, but the semi is certainly fun to watch.)
And for those who are wondering, I'm told it's the Trans-Siberian Orchestra playing "Wizards in Winter" which the lights are synched to.
If that doesn't capture the true spirit of Christmas, I don't know what does...