'Dark Knight' still soars with $42.7M weekend

Mummy: Tomb of the Dragon Emperor,' Universal, $40,457,770, 3,760 locations, $10,760 average, $40,457,770, one week. 3. 'Step Brothers,' Sony, $16,506,526, 3,094 locations, $5,335 average, $63,172,026, two weeks. 4. 'Mamma Mia!', Universal, $12,615,515,...