Brief Description
The Visual Studio 2005 Software Development Kit (SDK) version 4.0 includes tools, documentation, and samples for developers to write, build, test, and deploy extensions for Visual Studio 2005.
http://www.microsoft.com/downloads/details.aspx?FamilyID=51a5c65b-c020-4e08-8ac0-3eb9c06996f4&DisplayLang=en
http://www.microsoft.com/downloads/details.aspx?FamilyID=51a5c65b-c020-4e08-8ac0-3eb9c06996f4&DisplayLang=en