Ten days ago, an ExxonMobil pipeline pumping crude oil from the Alberta tar sands down to Texas refineries burst open in Mayflower, Ark., causing the evacuation of nearly two dozen homes and coating wildlife and the surrounding area in thousands of gallons of oil. I'm sorry, sludge. But there's a silver lining! And no, I'm not talking about the reflective sheen of tar sands oil coating a five-mile radius, ha ha. No, folks, the silver lining is: Business is booming!