This week's issue of JAMA (Journal of the American Medical Association) has 
a research letter reporting a death from carbon monoxide poisoning during 
coffee roasting.  A 23 year old male dropped a tool into a storage tank used 
to store freshly-roasted coffee.  He went into the tank, collapsed, was 
removed from the tank and resuscitation was unsuccessful.  The autopsy 
showed high blood levels of carbon monoxide.  Air samples from the storage 
tanks showed extremely high levels of carbon monoxide within the tanks.
A chilling tale of what happens from CO outgassing when roasting and storing 
commercial quantities of coffee.   Fortunately not an issue at the 
homeroasting level, although I guess you wouldn't want to get a bunch of 
HotTop owners all roasting together in a small airtight room!
Michael Lloyd
MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.  http://join.msn.com/?page=features/virus