Microsoft is planning an add-in for Visual Studio 2005 (currently in beta). A Web Deployment Project enables you to manage not only build configuration and merge options, but other tasks such as specifying changes for the application’s Web.config file during compilation, changing connection strings, creating virtual directories, and performing other tasks at specific points in the deployment process.
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 that enables you to merge the assemblies created during ASP.NET 2.0 precompilation, and it provides a comprehensive UI within Visual Studio 2005 for managing build configurations, merging, and pre-build and post-build task using MSBuild.
Download it at source: Visual Studio 2005 Web Deployment Projects (Beta Preview).