Microsoft Windows SDK 7.1

Microsoft releases Windows SDK for Windows 7 and .NET Framework 4 on May 19. It has three versions: x86, x64 and Itanium. The  ISO image direct download is listed as followings:
x86 ISO: http://download.microsoft.com/download/F/1/0/F10113F5-B750-4969-A255-274341AC6BCE/GRMSDK_EN_DVD.iso
x64 ISO: http://download.microsoft.com/download/F/1/0/F10113F5-B750-4969-A255-274341AC6BCE/GRMSDKX_EN_DVD.iso
Itanium ISO: http://download.microsoft.com/download/F/1/0/F10113F5-B750-4969-A255-274341AC6BCE/GRMSDKIAI_EN_DVD.iso

System Requirements

• Supported Operating Systems: Windows 7; Windows Server 2003 R2 (32-Bit x86); Windows Server 2003 R2 x64 editions; Windows Server 2008; Windows Server 2008 R2; Windows Vista; Windows XP Service Pack 3

• Platform architecture: Install this SDK on and/or create applications for platform chipsets X86, X64, and Itanium.
• .NET Framework: Create applications that target .NET Framework versions 2.0, 3.0, 3.5, 4.
• Visual Studio: Use the resources in this SDK with Visual Studio versions 2005, 2008, and 2010, including Express editions (Not all features work with all versions of Visual Studio. For example, you cannot use the .NET 4 tools with Visual Studio 2008.)