I saw this case study and thought I would share, and it has some really good info into what goes into a private cloud. Microsoft moves to the Private Cloud by planning, architecting, developing and managing the first Private Cloud solution within the Microsoft datacenter. The combination of shared resources, flexible capacity, charge back, and overall self-service model are all components that make Microsoft’s internal deployment of the Private Cloud so unique.
How Microsoft IT Developed a Private Cloud Infrastructure
If you want to test drive the products that Microsoft uses take a look here: