Part of the tragedy of Hurricane Katrina is measured in the number of people killed by the storm. Thousands of people are still missing, and the agencies searching for them are not sure how high the death count will go. The red dots on this map [above] represents a missing person in the Greater New Orleans area. Two months ago, Sally Hoy, a hurricane evacuee from Kenner, began working for FEMA. Hoy is one of dozens of people working at the Find Family National Call Center, the group that's trying to locate all of Hurricane Katrina's missing persons. Hoy is...