(the video is 27-28 min long)
I'll make it short, it's awesome. I've watched videos from this guy before and I've liked 'em very much and this one is no exception.
You learn a LOT about the smoke simulation tool in Blender but not only that he then shows you how he's used it in his own project so you've got some very "educational" information but also a very practical approach as well which is really cool.
(Oh and he's supposed to make another video on how to make Fire!
)