Hmmm, one simple way would be to have a sleeper agent tip a briefcase full of the stuff onto the tracks of a deserted NYC subway station round closing time, so that the aerosol gets dispersed pneumatically for maximimum exposure to the four million people who use the system the next day. Expect a death toll in the hundreds of thousands to millions, plus total economic loss of the city. That's from one sleeper -- one "human missile," to use Iraqi parlance.
Of course, we know from 9-11 and the fires of Kuwait that Saddam thinks bigger than a single attack by a single agent. This is not unanticipated: since receiving the anthrax threats, Bush has ordered 100 million doses of Cipro and 25 million doses of a new anthrax "morning after" vaccine. He's also ordered 300 million doses of smallpox vaccine.
9-11 was the mother of all surprise attacks. Expect the mother of all battles before we are finally rid of its ultimate author.
Here's a bit more background reading, if you want to figure out what's really going down:
Contradicting Some U.S. Officials, 3 Scientists Call Anthrax Powder High-Grade
On a more serious note, I tend to believe the administration has already received an if you...then you can expect...message. Should be interesting-I, personally, don't tend to think we will make a move on Iraq anytime in the near future. I think it is checkmate.