OK, its only been a month, but using pine straw in my run has been a great success. Its fluffy, dries on top rapidly after rain, and is free for the raking. Additionally, its got a naturally pleasant odor and isn't inclined to smell sour when wet. The chickens can readily scratch it aside to access the dirt for dust bathing too. I'm using shavings in the coop since they're more absorbent, but the pine straw in the run -- adding a little extra ever couple weeks, is working well so far.