Just want to bring awareness of a new article that me, Tom Shinder and the Windows Server Team put together. This article explains the following points about designing your cloud infrastructure:

• Cloud Infrastructure Technical Overview. This section provides a short overview of cloud computing and the requirements of a cloud infrastructure.
• Cloud Infrastructure Design. This section provides an introduction to the cloud infrastructure design process.
• Designing the Cloud Storage Infrastructure. This section provides information related to design considerations for building the cloud storage infrastructure using Windows Server 2012 platform features and capabilities.
• Designing the Cloud Network Infrastructure. This section provides information related to design considerations for building the cloud network infrastructure by using Windows Server 2012 platform features and capabilities.
• Designing the Cloud Compute (Virtualization) Infrastructure. This section provides information related to design considerations for building the cloud compute (virtualization) infrastructure using Windows Server 2012 platform features and capabilities.
• Overview of Suggested Cloud Infrastructure Deployment Scenarios. This section provides information on three suggested cloud infrastructure deployment scenarios and the design decisions that drive selecting one over the other.

We embedded lots of security considerations in this design based on our security background and we hope you like it:

http://technet.microsoft.com/en-us/library/hh831630.aspx