Hey Nels,
I recently (within the last couple of days) updated
the FAQ with fresh, up-to-date information.
 	
What achitectures are supported? 		
cAos	 	x86 currently and x86_64 (AMD64) soon
CentOS-2	x86 only (sorry)
CentOS-3	x86 currently and x86_64 (AMD64) soon
Get it from the source here:
http://caosity.org/index.php?option=faq&task=viewfaq&artid=3&Itemid=5
I was told that AMD64 would be supported "soon".  
We could pin Greg down if you need a more specific
answer. 
Rick
--- centos-request at caosity.org wrote:
> CentOS appears to only be available for the i386
> architecture.  Are 
> alternative architecture rebuilds outside the scope
> of the CentOS 
> project, or is there some other specific reason for
> that?
>
>
> Nels Lindquist <*>
> Information Systems Manager
> Morningstar Air Express Inc.
> 
>