Before you plunk down serious cash on an enterprise virtualization solution, check out the free, open-source ProxMox VE.  It is based on two mature open-source virtualization products, namely OpenVZ and KVM.  I maintain two physical ProxMox VE servers running a total of eight virtual machine “guests”, including Ubuntu 8.04, Ubuntu 9.04, Windows 2003, and CentOS.  So far, the expirience has been nothing but positive.

To download ProxMox VE, head over to the developers website at www.proxmox.com and find ProxMox VE on their product page.  Or just go straight to pve.proxmox.com to get right into the good stuff.

There’s also a good review of ProxMox over at www.montanalinux.org.