Thanks for the replies so far! They're especially useful for me since I don't have much building experience. Everybody feel free to drop any other tips or suggestions that you might think of!
What tips do you guys/gals have for keeping water from running/leaking into your coop?
I'm nearly done with getting my wood coop up and keep wondering what things I can still do to keep water from entering the coop on a rainy day. I'm seriously considering hosing down my coop when I'm done...