Jesse Lind You just take a long exposure shot and wave around a flashlight while it is taking the photo. It's quite easy. You should try it! :)
here are some other examples:
tookapic.com/photos/20934
tookapic.com/photos/18887
tookapic.com/photos/18797
Joel G Mwakasege Jr. You make it sound too easy, let me do that and I will let you know :)
Joel G Mwakasege Jr. Ohoo ok, this looks amazing, though still I would love to know a way around to capturing amazing things like this one :)