It is, however the virtualisation server may not be able to virtualise your ColdFusion code (it basically depends on how well ColdFusion runs on Tomcat - something I'm not familiar with).
In terms of the physical process of loading your site into Alfresco, the following post is a good place to start (although this post is in the context of Interwoven, the general migration process is technology independent): http://forums.alfresco.com/en/viewtopic.php?f=10&t=12734.
