More info here on virtual appliances: http://www.vmware.com/appliances/directory/cat/502
It would be agile to create a self contained, monolithic OS, Database, web server, forum software all in one bundle (virtual guest), that is preconfigured, tuned and complete with all the trimings.
Many are using virtualization as rapid deployment, e.g. ISP's, cloud computing, etc; any plans to make a virtualization appliance that could be rapidly deployed is a good move.
Taken a step further, abstract the database as a separate component for replication, D.R. - disparate locations (for failover), etc.
With a virtual infrastructure your whole platform would be fluid, combined with vmotion load could easily be balanced as well.
Other hyper-visors and cloud computing efforts could benefit from an appliance(images) as well, Amazon EC2, Eucalyptus, OpenStack , etc
hehe, a Xen xenforo image would be downright cool