But CIOs on the front lines of virtualization efforts know the reality of the problem: VMs can be deployed in minutes, which is a big advantage on the tactical side—and a big worry on the management side.

After initial virtualization deployments wowed business people with their ability to save money and speed up processes like IT provisioning, the number of VMs quickly escalated in enterprises. Issues like balancing workloads on virtualized servers and tracking all those VMs became much more important. The big vendors in the space, VMware and Xen (now owned by Citrix), were, to some extent, learning along with the customers about the everyday management headaches and concerns.

Only as more of those worries arose did rival companies come knocking on CIOs' doors with products designed to provide a comprehensive look at the virtualized data center, manage it and protect it.

Sure, VMware and Citrix/Xen have their own management tools. But who are the other key companies innovating in this area? We talked to CIOs and industry analysts to narrow down a list of ten virtualization management and security vendors that should be on any IT leader's radar screen in 2008.

1. CiRBA

CiRBA's Data Center Intelligence Software can help IT leaders analyze and visually map how to migrate and consolidate servers to a virtualized environment. For instance, CiRBA's tools help you figure out which servers and applications can coexist efficiently. The tools analyze factors such as application middleware, database configurations, required service levels and workload patterns. Then CiRBA's tools can help manage the virtualized environment. "CiRBA's planning tool is extensible, allowing planners to add custom evaluation criteria to any planning scenario," says Burton Group senior analyst Chris Wolf. "This is extremely valuable." CiRBA's tools can also be used in planning for OS virtualization, application stacking and migrations to blade environments—and prove helpful for virtualization security audits, notes Wolf.

2. Vizioncore

Who's got your virtual backup? Many CIOs continue to choose Vizioncore, which has become well-known for its VM backup tool, vRanger Pro. But Vizioncore tackles performance management as well. Vizioncore tools like vCharter, which examines what's going on inside each VM, can provide a window into utilization and performance questions. For a look at one company's tactical experience with Vizioncore, see How Server Virtualization Tools Can Balance Data Center Loads.