Migraineman writes "NASA has released a 400-page Columbia Crew Survival Investigation Report [16MB PDF.] If you're interested in a detailed examination and timeline of the events leading to the destruction of Columbia, this is well worth the time. The report includes a number of recommendations to increase survivability of future missions."
Reader bezking points out CNN's story on the report, which says that problems with the astronauts' restraint systems
were the ultimate cause of death for the seven astronauts on board.