Hi Ken, Great article! For those ISVs who are new to virtual appliances, you should also know that there are physical appliance vendors out there that can take complete responsibility for bringing your application to G.A. as a virtual appliance. One of them happens to be NEI, (http://www.nei.com/solutiondesign); who has been deploying both physical and virtual appliances for years with JeOS, remote health monitoring, updates and image backup capabilities. The ROI/metrics behind this is based upon keeping your engineers developing new functionality for your application, rather than diverting their attention to managing the ongoing virtualization process. - Bill »