There's a really cool setup I've seen on this forum which I'm incorporating into the new coop I'm building - a floor-level "poop flap" opening on one of the walls. When it's cleaning time, you open the flap and just push everything out through the opening with a push broom. Less dust and less work, since you're not lifting and dumping. If you can cut out the flap on a wall adjoining the run, you can just push the litter out into the run, and the chickens will spread it for you. If your coop is elevated, you can put a wheelbarrow right by the flap and push the litter out into it. I'm going to put my poop flap opening on the side facing the compost pile, so the litter will go right into the compost area behind the coop.