I scrape the poop board and put it in the composter. I have the rotating kind, so once it's full, I close it up and rotate it every day for @3 weeks (a little longer in the winter), and voila - compost. Then it goes into the pile for when I'm ready to use it. Before chickens, it took FOREVER to get good compost. Now, that puppy cooks up in no time! Gotta love it!
In the late fall I clean out the whole coop and cover the next year's garden with it. With the poop board and several inches of shavings on the floor, it only needs cleaned out completely once a year (right before winter, when they will be spending more time in there).