Virtual server with VirtualBox

The virtualization solution "VirtualBox" by Sun is very simple to implement and efficient. 

It is possible to run virtual machines in headless mode, ie accessible by remote display. Regarding connectivity of virtual machines it is possible to use the NAT mode or implement an bridged interface.

I use Virtualbox this way on a server, that works without being stopped last year. I have found no problems, so I think VirtualBox is a real alternative to other virtualization solutions. Especially since the last version of VirtualBox allows to switch virtual machines to another host without interrupt service  (teleport functionality).

The virtual machines launch in headless mode is done by command line, which may be repulsive for neophyte; Fortunately there is a project called "vboxweb" which provides the equivalent of the VirtualBox console, but in web mode with virtual machines launch in Headless mode. All features are not implemented yet but the project seems promising and active.