The Agonist has an interesting post that examines the mortality rates for SARS. Based on rough mathematic evidence, the mortality rate for SARS appears to be from 13.8% to 18.6%.
If so, the SARS outbreak could be the deadliest epidemic since the killer influenza of 1918. The Agonist has been following the story closely, and is a good source for breaking news on the spread of SARS.