As I sat indoors this past season in some of the coldest weather we'd seen in many winters, with my children bored and irritable, full of energy with no place to expend it, I longed for the warmer days of spring and summer when I could set them loose on the playground. Now the opportunity is here, and I've breathed a sigh of relief. But as any parent can attest, the playground brings its own challenges. At times the politics on the playground rival those of the Capital in Washington. Is it o.k.