IO
I haven't the time or data to analyse the whole world, but some detailed & updated numbers for Hong Kong are here:
http://home.so-net.com.hk/~pns/
Roughly, over the last month in HK since this broke about three times as many people have died from SARS as you would expect from transport accidents in the same period.
But on the other hand roughly 6 times as many people would be expected to die in that period from "typical" pneumonia as have died from SARS.
Which means the risk is still very low it is not igsignificant. What has changed in the last 2 or 3 days is that younger, previously healthy people are now starting to die from it. Whether this is because they sought treatment too late is still open to debate.