Visual Studio 2005 Web Deployment Projects provide additional functionality for building and deploying Web site applications that you create in ASP.NET 2.0 and Visual Studio 2005. This add-in includes a new tool to merge the assemblies created during ASP.NET 2.0 precompilation, and provides a comprehensive UI within Visual Studio 2005 for managing build configurations, merging, and using pre-build and post-build tasks with MSBuild.

http://msdn.microsoft.com/asp.net/reference/infrastructure/wdp/default.aspx
http://download.microsoft.com/download/2/f/1/2f12a7b2-9ca1-4e42-90e2-61d69030cc26/WebDeploymentSetup.msi