Agreed on the bird sounds. I think it works so good because a bird going crazy at night just isn't natural. It also is death on grey foxes.
I start my coon stands with about 10 minutes of a woodpecker distress, followed by about 5 minutes of a coon fight, then repeat it. Usually the coons will come in, and climb a tree around you somewhere. Make sure to scan the trees really close 360 dgrees around you for at least 150 yards before you leave.