Eugene, Ore. is usually best known as the home of the University of Oregon and the birthplace of Nike. Now it can add another bona fide to that list: It is one of the least economically segregated areas in the country. The word "segregation" is typically associated with people of different races and ethnicities. But a recent report by the Urban Institute, a Washington economic and social policy think tank, also examined 100 major metropolitan areas to see how divided they are by neighborhoods of different income levels.