I've seen images of alignments of the SARS genome with other coronaviruses and it is definitely not an artificial hybrid. Which is probably a good thing.

If I were the North Koreans, I would be looking to develop something nasty to release into South Korea in the event of a US invasion. I'm quite surprised that the Iraqis didn't do the same (unless, of course, they *don't* have any WMDs - but that's way too far-fetched, right?).