As much as anyone, Stephen Chipman knows the toll the rocky economy has taken on U.S. businesses over the past couple of years. He's CEO of Grant Thornton LLP. It's the U.S. member firm of Grant Thornton International, which provides tax, accounting and consulting services to clients worldwide. The U.S. operation has a staff of around 6,000 and logs more than $1 billion in annual revenue. Grant Thornton LLP recently published its quarterly