In these days I put on production two different server (an internal machine and a EQ4 hetzner) using Proxmox as backend for managing virtual machines.
What is Proxmox?
Proxmox Virtual Environment is an easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines.
Proxmox VE is an open source project, developed and maintained by Proxmox Server Solutions GmbH.
I am very excited of the new features introduced by the new Virtualbox 2.1:
A new management for the network permits to forget the creation of a manual bridge interface where putting the real eth server with the tun/tap vbox fake interfaces.