After getting off to a painfully slow start, President Bush's signature foreign aid program is poised to begin ramping up the amount of money it spends on development projects in poor countries, according to its new chief executive -- who vows that the impact will be "transformative." John J. Danilovich, the former ambassador whom Bush installed as head of the Millennium Challenge Corp. in November, said the agency is adopting a new strategy to fulfill its mission of providing aid to well-governed nations. It will winnow recipients to a short list but intends to give them significantly bigger grants than...