good for more than blowing leaves around the yard. turns out it works great at drying under your snap-together flooring. (had a pipe blow out on me in the master bathroom). best part was that the entire floor lifted up from the pressure. it was a neat physics trick.
I also once used it to clean the drywall dust out of a room in which I had just completed my final sanding (after drywalling the walls and ceiling). I put a big box fan in the window blowing out and kept pushing the cloud towards it. (I swept up the majority of the dust first)