ANN ARBOR, Mich. - American relations with China have improved in a way that few could have imagined when the Bush administration entered office and declared China a "strategic competitor." Now signs of serious cooperation are everywhere. China has worked with the United States on the global counterterrorism effort, will not be the spoiler on a new United Nations resolution on Iraq, has recently adopted stringent regulations on dual-use missile technology exports and other proliferation issues, and is discussing cooperation with the United States on North Korea. Meanwhile, the White House did not oppose Beijing's bid for the 2008 Olympic...