This paper defines cloud computing, details its benefits, issues, risks, and describes a cloud computing maturity model.
A research study on the total cost of ownership (TCO) of open source software.
Read this excellent discussion before you make up your mind on the business case for open source systems.
This paper presents a framework to calculate the total cost of ownership of virtualization on a multi-processor based platform.
An excellent soup to nuts discussion on virtualization. This is perhaps the best presentation on Virtualization that I have reviewed. MUST READ!