A very interesting article from The Register has been published which contains information on how many different virtualisation technologies companies use at the time. This clearly shows that there is no single winner when it comes to commercial use of technologies such as Xen, KVM or VMWare's solutions.

GigaTux will keep on using Xen for now, but are keeping an eye on KVM particularly. We are intending on only considering open source virtualisation solutions, so VMWare is out of the picture for us, but the article above certainly shows that competition is present, and competition is generally a good thing!