Virtualisation Maturity Model
Here's an interesting article by Peter Koen that refers extensively to the Virtualisation Maturity Model that Peter Richardson and I invented for Edition 18 of The Architecture Journal. Lots of fun to see that we are being quoted, even if I wasn't aware that the article existed until today: http://architects.dzone.com/articles/part-1-move-blue-cloud-save. It is quite a good read though, so I recommend you go and have a look.