In short; a private cloud is an on-premise, virtualized farm that can automatically grow to cater for your needs. The key here is automated. Simply creating an over-sized static farm and allowing applications to run here is not the same thing; that’s traditional hosting.
In addition, a hybrid cloud is where the private cloud also uses public cloud services, such as Office 365,
Private cloud architectures are becoming popular and a large amount of good resources are out there for you right now. Why not take a look?
Private Cloud For the Technical Decision Maker
Microsoft has published an excellent overview of the different types of cloud service models and their impact on investment, governance, level of control and the challenges a business might face.
MOF Infrastructure and Planning Design Guide
Microsoft has release a whitepaper guide on how to use the Microsoft Operations Framework for service management of a private cloud. Available now after registration on the Microsoft Connect site.
Optimizing SQL Server for Private Cloud
SQL Server 2012 codename “Denali” contains many service-optimizations for cloud services. Microsoft has released a poster and a guidance on how to optimize SQL server resources for a private cloud deployment.
Video: How to Build a Private Cloud
Chris Henley discusses “the emergence of a private cloud as the logical next step in virtualization and the amazing benefits that you can get by automating IT services in your organization”.
Deploying Cloud-Based Solutions
Finally, Phil Wiklund has released a book on cloud deployments for SharePoint. I found out about the book while attending Phil’s session at the Microsoft SharePoint Conference in Anaheim (read my recap of the session). The book is very well written and I recommend it to anyone in the process of planning or deploying cloud solutions.
Deploying Cloud-Based Solutions, available from O’Reilly