Washington Post: The North American International Auto Show, the annual automotive gala in Detroit, may be best known as a stage for manufacturers to display their latest rolling leviathans. But to judge from this year’s show, the next big thing may be small. Driven in part by the recession, and in part by shifting consumer tastes and global marketing strategies, the U.S. manufacturers who once obsessed over trucks and muscle cars are casting a spotlight on their diminutives. Chevrolet …