HOUSTON -- Nineteen months after Hurricane Katrina sent evacuees from New Orleans streaming into Houston, more than 5,000 heads of households among them are still unemployed despite the city's booming economy, officials say. The number of jobless is contributing to the sense among some Houston-area residents that the storm's victims are a drain on the city and have worn out their welcome. After the storm, a quarter-million evacuees were brought to Houston, welcomed by Mayor Bill White, who threw open the Astrodome. Even before the storm, many were desperately poor, unemployed and on welfare or food stamps. Many had been...