A new white paper about Windows Storage Server 2008 R2 Architecture and Deployment (including the Microsoft iSCSI Software Target 3.3) has just been published.
Here's an outline of this content:

• Introduction
• Windows Storage Server 2008 R2 Overview
  • Comparing Windows Server Operating System Storage Offerings
    • Comparing Windows Storage Server with Windows Server
    • Identifying Windows Storage Server Features
    • What’s New in Windows Storage Server 2008 R2
  • Comparing Windows Storage Server 2008 R2 with Windows Server 2008 R2
  • Windows Storage Server 2008 R2 Editions
  • Identifying Storage Challenges
    • Identify Scalability Storage Challenges
    • Identify Availability Storage Challenges
    • Identify Security Storage Challenges
    • Identify Manageability Storage Challenges
    • Identify Data Recovery Storage Challenges
  • Identifying Windows Storage Server Solution Benefits 
    • Identifying Scalability Benefits  
    • Identifying Availability Benefits  
    • Identifying Security Benefits
    • Identifying Manageability Benefits
    • Identifying Data Recovery Benefits
• Exploring Windows Storage Server Features and Capabilities
  • Providing Access to File Services Workloads
    • Supporting File Services Workloads Using CIFS, SMB, or SMB2
    • Supporting File Services Workloads Using NFS
    • Supporting File Services Workloads Using WebDAV
    • Supporting File Services Workloads Using Windows SharePoint Services
  • Providing Access to iSCSI Block I/O Workloads
    • Supporting iSCSI Block I/O Workloads Using Microsoft iSCSI Software Target
    • Supporting iSCSI Boot
  • Providing Access to Web Services Workloads
  • Providing Access to FTP Services Workloads
  • Providing Access to Print Services Workloads
  • Providing Reduction in Power Consumption
    • Improve the Power Efficiency of Individual Servers
    • Processor Power Management
    • Storage Power Management
    • Additional Power Saving Features
  • Performing Highly Automated Installations
• Managing Windows Storage Server
  • Management Tools for All Workloads
  • Managing Power Consumption for All Workloads
    • Remote Manageability of Power Policy
    • In-Band Power Metering and Budgeting
  • Managing File Services Workloads
    • Managing File Services Using File Server Resource Manager
    • Managing File Services Using Share and Storage Management 
    • Managing DFS Namespaces and DFS Replication
    • Managing Single Instance Storage
  • Managing iSCSI Block I/O Workloads
    • Managing the Microsoft iSCSI Software Target for iSCSI Block I/O Workloads
    • Managing the Microsoft iSCSI Software Initiator for iSCSI Block I/O Workloads
    • Managing iSCSI Block I/O Workloads Using Windows PowerShell
  • Managing Web Services Workloads
  • Managing Print Services Workloads
• Protecting Windows Storage Server Workload Data
  • Using Windows Server Backup to Protect Data 
  • Using Shadow Copies of Shared Folders to Protect Data
  • Using the Volume Shadow Copy Service to Protect Data
  • Using LUN Resynchronization to Protect Data
    • Comparison of LUN Resynchronization and Traditional Volume Shadow Copy Service
    • Comparison of LUN Resynchronization and LUN Swap
    • Benefits of Performing Full Volume Recovery Using LUN Resynchronization
    • Process for Performing Full Volume Recovery Using LUN Resynchronization
  • Using DFS Replication to Protect Data
  • Using Automated System Recovery to Protect Data
  • Using System Center Data Protection Manager 2007 to Protect Data
  • Using Virtual Disk Snapshots to Protect Data
  • Using the Appcmd.exe Tool to Backup IIS Configuration
  • Using the PrintBRM.exe Tool to Backup Printer Information
• Securing Windows Storage Server Workloads
  • Securing Windows Storage Server for All Workloads
  • Securing File Services Workloads
  • Securing iSCSI Block I/O Workloads
  • Securing Web Services Workloads
  • Securing Print Services Workloads
• Improving Availability of Windows Storage Server Workloads
  • Improving Availability of File Services Workloads
  • Improving Availability of iSCSI Block I/O Workloads
    • Creating Highly-Available iSCSI Targets 
    • Creating Highly-Available iSCSI Initiators
  • Improving Availability of Web Services Workloads
  • Improving Availability of Print Services Workloads
• Improving Performance and Scalability for Windows Storage Server Solutions
  • Improving Performance and Scalability for All Workloads
    • Improvements in Processor and Memory Capacity
    • Improvements in the Next Generation TCP/IP Protocol
    • Improvements in Network Adapter Performance
    • Reduction in Processor Utilization for I/O Operations
  • Improving Performance and Scalability for File Services Workloads
    • Review Improvements in the SMB2 Protocol
    • Review SMB-based File Services Workload Test Results
    • Reviewing Performance Improvements in SMB Version 2.1 in Windows Server 2008 R2 
    • Improving Performance for Branch Offices Using BranchCache  
    • Improving Performance for Folder Redirection and Offline Files
  • Improving Performance and Scalability for iSCSI Block I/O Workloads
    • Identify Methods for Improving iSCSI Block I/O Workload Performance and Scalability
    • Review I/O Storage Test Results
  • Improving Performance and Scalability for Web Services Workloads
    • Identify Methods for Improving Web Services Workload Performance and Scalability
    • Review Web Services Workload Test Results
  • Improving Performance and Scalability for Print Workloads
• Windows Storage Server Deployment Scenarios
  • Overview of Windows Storage Server Configurations
    • Using Windows Storage Server in a Stand-Alone NAS Configuration
    • Using Windows Storage Server in a Highly-Available NAS Configuration
    • Using Windows Storage Server in a NAS Gateway Configuration
    • Using Windows Storage Server in iSCSI Block I/O Configuration
  • Creating Branch Office Solutions
  • Creating Highly-Available Solutions
  • Creating Solutions for Storage Consolidation
  • Creating Small to Medium Business Solutions
  • Creating Solutions for Heterogeneous Environments
  • Creating Application Consolidation Solutions
  • Creating Unified Storage Solutions
  • Creating Virtualization Solutions
    • Connecting Virtual Machines to iSCSI LUNs
    • Running Virtual Machines on Windows Storage Server 
  • Creating iSCSI Boot Solutions
• Conclusion
• More Information

If that outline sounds interesting, download and read the entire 126-page PDF document from
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=b8a8edb3-832c-4bf0-a177-1bac8963d3fd