The Infrastructure Planning and Design guide series gives you architectural guidance for Microsoft infrastructure products. The IPD guides help clarify and streamline design processes for Microsoft infrastructure technologies, with each guide addressing a unique infrastructure technology or scenario. 
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IPD guides provide:

• Concise planning guidance to design an infrastructure for Microsoft technologies
• The critical decisions to be addressed and the available options
• A means to validate design decisions with the business to ensure that the solution meets the requirements of both business and infrastructure stakeholders
  
  Updated! Infrastructure Planning and Design (IPD) Guide for Selecting the Right Virtualization Technology
  Updated to include coverage of Windows Server 2008 R2 Remote Desktop Services and Virtual Desktop Infrastructure (VDI), this guide walks the reader through the process of selecting the right virtualization technology for each workload—in five steps or fewer.
• New! Infrastructure Planning and Design (IPD) Guide for Windows Server 2008 R2 Remote Desktop Services
  Streamline your planning and design process for implementing the Remote Desktop Services infrastructure by using the simple nine-step process presented in this guide. Use this guide to save time and clarify your design and planning process.
• New Beta! Infrastructure Planning and Design (IPD) Guide for Microsoft Forefront Unified Access Gateway
  Follow the simple, three-step process in this guide to successfully design Microsoft Forefront Unified Access Gateway infrastructure.
• New! Infrastructure Planning and Design (IPD) Guide for DirectAccess
  This guide provides actionable guidance for designing a DirectAccess infrastructure. The guide’s easy-to-follow, four-step process gives a straightforward explanation of the infrastructure required for clients to be connected from the Internet to resources on the corporate network, whether or not the organization has begun deploying IPv6.

Here is a list of all of them:

IPD One-click Downloads Download the entire IPD series Download the IPD series intro IPD Guides for Virtualization Microsoft Enterprise Desktop Virtualization App-V Windows Server 2008 R2 Remote Desktop Services Terminal Services Windows Server Virtualization* Selecting the Right Virtualization Technology* IPD Guides for Windows Server Windows Server Virtualization* Windows Deployment Services* Windows Server 2008 R2 Remote Desktop Services Terminal Services Internet Information Services* Print Services* File Services* Active Directory Domain Services* DirectAccess IPD Guides for Security Forefront Unified Access Gateway (Beta) (Live ID Required) *updated for Windows Server 2008 R2 IPD Guides for System Center System Center Data Protection Manager 2007 SP1 System Center Virtual Machine Manager 2008 and R2 (updated) System Center Operations Manager 2007 and R2 (updated) System Center Configuration Manager 2007 IPD Guides for Optimized Desktop Scenarios Windows Optimized Desktop Scenarios DirectAccess IPD Guides for SQL Server SQL Server 2008 IPD Guides for Microsoft Online Services SharePoint Online: Evaluating Software-plus-Services Exchange Online: Evaluating Software-plus-Services IPD Guides for Network Access Protection Selecting the Right NAP Architecture

Infrastructure Planning and Design Guide Series